I unplugged and rebooted each speaker a few times that day to no avail.
But things went back to normal the next day. I'm not going to sweat it
unless it happens again.
I'm having this problem as well. It started yesterday morning. Both of
my Google speakers cannot come up with a response, take forever, and
then say hmm something went wrong try again in a few minutes. I think a
recent update borked them but I can't ...