I recently started a multiplayer campaign ~400AD with a few other people and we managed to play a 2-3 hour sessions pretty smoothy.
BUT
For some reason, whenever I play singleplayer my game ends up freezing

. I make sure to turn off the event messages for newly discovered provinces/territories which doesn't solve the problem.
I've been attempting to start from the WW2 campaign as the Third Reich. After maybe 2-3 months the game just freezes on me. I tried starting as the same country from the Rise of Evil campaign, and I'm actually able to go a couple more months without it freezing; however, it still freezes!
It's just weird that I was able to play multiplayer without this problem but not singleplayer.
Has anyone experienced this issue of singleplayer game freezes and/or know how to resolve the issue???
ALSO
I don't understand why Third Reich starts out with Terra Incognita. I mean. . . come on Nazi Germany had maps of the USA.
And another thing: How come, with the 10:2 infantry/cavalry ratio rule, the Third Reich starts with so many units of cavalry without infantry.
Even if I combine all the Third Reich's troupes together, the cavalry is more than 50%. This factor means I have to-- from the get go-- disband thousands of cavalry to keep economic stability. . .I just think that's weird.