They desperately need to fix this. I'm going through the same thing (slightly less extreme tho, 4 crashes was my max)
It definitely started around the Old Gods, New Blood update.
I have asked around in the discord and in matches and you are literally the only person to have the same problem as...
I crash almost every match like 2 times in a row and then doesnt crash for the rest of the match.
I've tried turning off steam and discord overlay. I've verified the integrity of my game files. I've closed literally every other application on my pc and Deadlock still crashes. this doesnt happen...