With anything newer than Proton 9.0-2 Special K causes RAM to fill up to exhaustion on launch of a game. 9.0-3 was recently promoted from RC and is probably causing this issue and your Deck to freeze
Can confirm Special K DLL injection was working before that update.
Software information
System information
Quoting Sangeki from the Special K thread:
Can confirm Special K DLL injection was working before that update.