I had hit in #emacs #EXWM C-x C-z one time too often (read: I acci-dented it twice) so disabled it:
`(put 'suspend-frame 'disabled "You probably don't want to suspend-frame in exwm")`
In exwm suspend-frame basically hits your frame with a tranquilizer and it's hard to wake.
@worldsendless Hmm, I had probably hit it a few times and thought it was a bug. Thanks!