Ive played the unit so many times now...

When i exit Detention Center for the second time in a game, a KERNEL32.dll error pops up and game closes.

It has happended three times in a row now...

Hum, a KERNEL32.dll error, not easy to diagnostic, can you just make a test :
Can you try this map with the same engine, but without coopordie. If the same bug appear localy on your machine that's it is not related to COOP or DIE. don't forget to use the same settings : coop mode, skill level 3 ...

I you want to reach the next mission with you account, it's not a problem, in the next release of COOP or DIE, champion like you who have beaten the entire game one time won't loose their teleporter when they death, so in theory you already have all teleporters

Yep, my quake is screwed.