First time posting ...
I too am having this exact same problem. I have a X50v and upgraded to WM5.0. That's when this whole problem started. I can take my Axim off the cradle and the battery has a full charge. If I leave it turned off out of the cradle for more then half a day and try to turn it back on, nothing. I have to do a soft reset (which ususally works) or remove the battery and put it back in to get it to start up again. This is completely frustrating

I haven't called Dell yet, but I am about to because I just can't stand this anymore. I would update the ROM, but the 2 posts I found for A04 and 05 both appear to be only for WM 2003 SE. If anyone has any other information on how to make this stop happening please, please post it.
I see posts form others stating they told active sync to stop trying to run every 5 minutes. I have looked through the options for Active Sync (version 4.1) on my desktop software and on the Axim and I can find no way to do this. Can someone please post the steps to get Active Sync to stop trying to run all the time?
Thank you.