After reformatting last night, I'm still seeing the issues this morning. For me, I can always trigger the failure, simply by opening Astro File Manager and trying to browse photos. I tried to use your Reload SD widget, and the system does remount the card. However, it only sees the card as being a blank or unreadable card, thus asking me if I want to format it! If I reboot (and thank goodness this phone reboots fast), then it'll see the card again. I noted during one try, that I could do plenty of other things like run SD Speed Test (a nice read/write test which doesn't work after the SD card fails), listen to music, or use the Gallery to browse photos. I'm going to try a few other things. I'll re reseat the card once again, and maybe test to see if there's wiggle room that could be the root cause. If so, I'll look into maybe using a scotch tape shim to secure it further. I'm also curious to try plugging the phone into my laptop after a failure, to see if I can see it as a USB drive still or not.