BCD536HP My 536 Erased Its Memory By Itself

I just turned on my 536 this morning and was greeted with some sort of ZIP code error message. I turned the scanner off, and then back on again and the error cleared. However, I then got a "Nothing to Scan" message. When I went and checked my favorites lists, it said that none were loaded. Apparently, my 536 cleared its memory all by itself for no apparent reason. The last time I had it hooked up to a computer was a few months ago, so I don't think that's the problem. It was working fine when I turned it off last night. This is the first real problem I've ever had with it since getting it back in April.