Massive lag problems

For two weeks I've been having serious lag problems playing RM. This doesn't happen when I play campaigns or against the AI.

The game just starts lagging a little for a few seconds, and it ends closing itself.

I play other Games like CoH or Total war, and in both of these games my pc runs just fine with no problems.

Has anyone experienced this kind of problems? Not gonna lie, but It's starting to kill my love for RM, I cant enjoy my matches anymore