Is there something to look for on the phone, other than system updates?
My phone woke up about fifteen minutes ago and, along with the GPS icon, there was a message in the status bar that said "Preparing SD Card". The GPS icon flashed for a bit and then went away. A couple of minutes later, it came back on and flashed for a bit and then went away. I thought I'd left a map running so I opened Task Killer and no map was open but I shut down all of the usual apps. Difference is, this time, instead of the usual 78M or so of available memory, I now have 114M of available memory.
No idea if it's related or not.