No, they were pretty standard lenght and I did not leave them too fast. Reinstalled entire game and all of the mods again today and have pretty much the same issue. First 2 reports have appeared ( they were delayed by like 10 seconds ) and after that I haven't recieved any other reports. 7 games played.
I'll try w/o unanonymized and sessions stats and we'll see.
EDIT: It was unanonymizer.
EDIT2: Well, it's not really unanomyzer. It was making issue worse but the reports still dissapear after few battles.