Carol, get an Uninterruptible Power Source/battery backup for your computer and monitor so that you can save your work and shut down safely in the event of a power interruption. Your hardware can be and eventually will be damaged if you do not. I turn my computer and monitor off when I'm done.
Any file that was being written to at the time of a power loss could be corrupted, I suppose.
I think in the Glossary Workshop under Transform there is a choice to Repair Glossary. You could try that on the glossary that seems to have a problem to see if that helps.