My 3 versions of the game crash

1. at the end of a match [different servers and maps] win/loss screen appears game disappears completely. no screen image, no stats page, nothing on task bar either.

2. end of match, stat screen appears but is blank with only the image in upper right, the same as no.1 happens, game disappears.

3. end of match stat screen comes up with stats but only for a mili sec.then all disappears.

the most I will get is 5 matches a day then I give up 3 of which are the crash issue. with 2 giving me stats and allowing me to proceed to play again.

sorry for the length of this I only know how to type in full words instead of appreviations.