The battery drained down overnight, which was a bit weird in and of itself.
So I charged it back up for about 4 hrs this morning and it's reporting a 90% charge. Cool. So I turn the radio back on. It works and the lil arrows are doing their thing... then it goes from full signal to "x" to "off".
It's done that about 15 times this morning. I cleared the event log. Pulled the battery out for a couple of minutes. Have a mess of free file space...