I'm having this issue as well. It's almost an year from the last post on this thread and it seems that the problem hasn't been resolved yet.

Eather i am playing stupid or i am stupid but i dont se aniy download link to your file:)

Milos Nova456

Dec 27, 16:40 CET

Helou there ppl:)I have to adres an isue that i hope it get pached.
Oldou Caesar 3 is an old game it need bug patch suport for the problem (not onliy i have but other ppl reported have similar problem)
Aperentliy what hapened to them hapened to me.
In Carthago m06 i whent to Dec 162 BC and what i notesed is...the game frizzes(dont nou if it min crash or not but it luck like it)
I opened task manager and se that Cr.exe is not responding(Caesar 3 as Cr.exe)
That is what hapened before i load map even 1 time as it continue to happen all the time after i load the game.Some person trayed to fix it but what worked for him didnt worked for me.
And here is his comment that he posted
-----------------------------------------------------
peter0204 posted 05-08-16 03:01 ET (US) 4 / 5:
Hey dudes, I just encounter this issues and is the first time for me. I couldn't find answers online but I just pass the 162BC august in to September without crashing! I realized right before it crashes the game made a "message" notice sound. So I figure it has something to do with the message. I found out, since the Emperor asked for 10 oil sometime ago and by the time I had a bunch in stock, I send 10 oil to him as soon as he asked me. This resulted that the Emperor's gratitude will happen at 162BC August and crashes the game. what I did is before the 162 BC August arrives, I open up the "messages" and delete some of them and then I just have the message box open at 162 BC august and read the newest message about emperor's gratitude message, then I close the box, the time passes to September. Honestly I was clicking around so I was not sure exactly what solve the issue, but what i know is, I read the message at 162 BC august and then close the message box then the time will keep going without crashing the game. hope this helps guys!
-------------------------------------------------------------------------------------
As i stated it didnt worked for me neather the think from the video that sey
1.Go to System protection
2.Advanced
3. Performance Option
4.Turn on Dep and select game that not responding then restart pc etc.
This also didnt worked for me.
I also run the game as administartor.
I didnt haved aniy problem like this in other missions from 1 to uper one beside Cartago...all of them work fine...game is fine.
If aniy help patch bug fix etc that you can provide that i can tray please send me it so i can tray fix it.
Oldou i nou ic an old game and because of it there will be no fix etc you culd still tray:)
I sended pictures so that you can se that it crash on that map on that date wich is ingame Dec 162 BC(On CD buy defoult it went to August 161 before it crashed)
Be noted that i seyed coples of times...the game work fine 100% onliy isue on this one map(do not automaticaliy state that because of this game not working at all etc as that is not the isue install etc is fine)
If aniy help come around let me nou:)

Also m8 i wuld like to save mine save file that i have problem with but you need to tell me what method or where suld i sendid to so you can get it.....aniy email adres or etc ?:)
Update you sey...?If there is an update alreadiy where can i download it(unlas update isnt posted yet)

Ic almost New year 2019 and still no fix to the problem:(
But to let you nou mine save file crased or frizze a bit difrentliy:)
1.GOG Caesar 3:File crased at Dec 162 CD(be noted that i moded (ceaser 3 model file)
2.CD Ceasar 3:Normal ceaser 3 model file no cange at all)i managed to get it to August 161 and then it lock up frizze and crashed and task manager sey tha the game is not responding.
Hau wird that it crashed difrentliy in C3 GOG and C3 CD game with or without moding model file...
I min there shuldnt be aniy problem on CD end but it is(unlas i used corupted c3 file that was crashing and i didnt started from CD point of...\Moded file December 162 moded gog cd August 161 CD...Wonder what make game in normal model files that make it past atlist to August 161 CD?
Strangliy i so alot of gleach as ppl are multiplaying on map towers are also acros the map as they shuldnt be,fort soldjers are at fort but there flags indicate that they are on ground not fort plas soldjer move in pleace not geting back to fort.
Creazzy isnt it ?:)

My bad, posted in the wrong thread

Just replayed the map to test if it still locked up for someone, the original save crashes but on restarting the map I was able to make it to 158BC without issue.
So this could be an intermittent problem or it's been patched.

If it's still crashing then you have to completely restart the map, whatever the problem is seems to be "baked in" on map generation so going back to an earlier in-map save will always result in the same crash.

Been poking around, weirdness happened.

I was able to get my crash save past the crashing point by deleting two gates in the southeast of the map (worked most of the time at least). But then what can only be described as corruption various points of the map and began to spread. Looking like a mass of birds with various unit sprites blinking in and out. When these sprites are of a unit they're r-clickable like a regular unit, they also all have the same name.

The corrupted tiles seem to be able to spread over anything and don't block movement or damage existing buildings however they do block new buildings from being placed anywhere over them.

Going to post my ramblings on it from a chat to see if anyone else has any better ideas on what the problem is. I DON'T know what I'm talking about really, I'm not a programmer or a software engineer so take it with a pinch of salt

"I don't have anywhere close to the technical knowledge needed to understand what's going on.
If I were to guess I'd say there's a pathing value or something that's being stored in a memory address it's not supposed to and isn't being cleared. Then something else wants to reference what's supposed to be there and getting a value that's invalid causing the lockup. Clearing the gates on mine seems to have bumped it enough to be a bit less invalid. Causing the corruption instead of a lockup"

What The_Anon seyed is corect:)
I have prof that the Carthago is noulonger crashing due to me and The_Anon managed to fix the problem(atlist temporaliy not permenantliy as it will never be permenantliy fixed:)
I sended him a save files and pictures that i beated it with np:)
Fearst time i used the corupted save that was crashing and solved the crash again with The_Anons help:)
He sugested to remove things from edges as hi seyed in a coment abowe this new one and it worked:)
Next time i started Caesar 3 from the begining up the Carthago and then i applied thiseym thing i did last time and it worked but this time not a singe crash not even one:)Started normaliy and ended normaliy:)
If somebody want mine save file as prof please lend me your email or something that you think ic safe so i can send you a save file so you can se hau ic done.

To all ppl on the forum who are reading this and the ppl who are yet to read this please aploud the The_Anon(who didnt done anithing special) but sugested what i shuld tray and what he sugested worked:)
He is a true genius and shuld get alot more respect from the ppl on the forum :)
The_Anon mine friend...i dont nou if you like to be popular but i am sorry if you sey you dont as i was traying to get you popular here :)I culd get some credits for this to but maniy more credits ghous for you rather then me :)