Well, I managed to run the older version...
In short,
Your previous Raid v2.73 version seems to be very stable in Gauntlet,
With concurrent 64 games and at least 4-5 times I tried in Gauntlet..
So no any single crash is recorded...
As conclusion,
Both (Raid v2.78i X and Patzer AI X..) are buggy (on my hardware + gauntlet..)
Hope helps ...
Greetings