I had a spare, so it was only down for a few minutes once I noticed the scanner had locked up.
Great to hear Jon. That one spare that I had was brand new and produced errors after the first two attempts following all recommended procedures. The third time, with the very same card and same procedures, it worked. Maybe some accumulation of electronic "what-not" on the contact points inside the radio that got cleared after a few insertions?
I'll give you the messages I got from the radio on the first two failed attempts:
First error:
SD Card Write Error
(code=0, 4)
Second Error:
SD Card Write Error
(code=1, 2)
I also experienced some SD Card Read errors--- if that happens again, I'll grab the codes.
Bottom line here for other folks who may have these kinds of errors--- before you completely panic, try a few different brands of cards and it may take a few attempts with the same card to get the unit up and running again. So far, three days with no error. (I know- I might have just jinxed myself, so knocking on a lot of wood. Thanks to all who contributed suggestions.