Combat immediately lost, nomatter how weak opponent...

[FreeHansje]

Since a few days each combat I enter is immediately lost by me. My character is a lvl 16 mage, I'm running around in Kordar. A previous save shows the same behaviour, if I go back a few saves then I can get into fights again.
I noticed the messages, that seemingly all my creatures are not under my control anymore, I wonder if this is related to the problem.
I'll just go back to the working save and hopefully will not encounter the problem anymore, but I would like to know if this is a known issue and if so, is there a solution for it?