Permanent problem with battles in SS 6.3 and 6.4

[certoipus]

Hi
I have this problem since 2011. And so I play without battles commanding

but I think problem is solveable

When I play battle, no matter what resolution and detail level, sometimes screen freez, and so game crash, cause I cannot do anythink.
But , when I play "custom battle" the problem never happens! Only during campaign, regardless on faction, number of units, anything... sometimes crash and thats all.
I have very good PC, any game I play on maximum details and so on, only my favorite game - SS - crash

It happens no matter it is clear SS or with any mod.

help pls

Maybe windowing will help? 'cause I play full screen always. But where to turn window on ? which file?