Clock issues.

Last night in the 1st qtr of the Varsity girls game we were having problems with the clock. A couple of times during the first 3 or 4 mins the clock would not stop when it should have. It wasn't working and the clock operator couldn't figure it out. We did finally get it working but I was wondering if anyone has had a problem where the clock didn't work and there was no backup? What did you do to handle this and how did it work?

Thanks.