constant crashes with patch 4

[DaGrenadier]

ok so im having some serious issues with the new patch, before the game was a laggy, buggy unpolished turd but it never crashed on me so i kept on going hoping that under all this crap there is a hidden gem. but now the game freezes or crashes all the time! especially when pressing the end turn battle and during siege battles due the fullstack enemy armies camped inside cities.

my specs are:

geforce gtx 760

i7-3770 cpu 3.40 GHz
8.00 G RAM

Windows 7

[DaGrenadier]

anyone?