In multi-inferior mode, I find I often will
accidentally type a RET.  I think this happens
because I am not sure if the prompt is available or
not, and so without thinking I type RET.
If the prompt is available and the last command
was "cont -a" (which in my recent cases it often is),
then I lose control again -- usually requiring redoing
my debug session (since I was stopped at that specific
spot for a reason...)

There's a more general problem here of gdb's non-stop
output being difficult to navigate.  However for this
particular problem I'd be happy with just a way to
disable the command-repetition feature.