Since I'm always in some sort of tmux/screen terminal, I find myself cycling through some combination of Ctrl+a q,Cntrl+q to make sure I didn't turn on flow-control (Ctrl+s).
This is why I have stty -ixon in my profile. I never use flow control anyway, not sure why I want it on.
arg flow control is the worst when trying to diagnose a frozen session. idk how many tines I've reset my network connection etc etc before realizing its gnu screen being silly (or really myself being silly)