Hello (and sorry for my english. I understand, but cant write very well :-)

I play U8 and I have some very annoying bug. First it start after the first encounter with Necromancer. When I talk to him, he didnt stop in one place throught conversation, so I must react very quickly. From this time, some textures blinking, npc spams with their common messages and I cant even speak with quest NPC (Mordea, sesneal etc.) So I load previous save and conversation continous normally and bug dissapear. But In one hour bug appears again when I realize how to steal dagger from mordea and go back to the Necromancer). So I again load save game before bug and it dissapear again. But in s short time.....you know :-(

Did anyone know what to do with this bug? Thanks