Originally Posted by
NJD_fan How do I get to a factory reset if I can't get it to the main screen?
I think you've been seeing precursors to failure for a while, the SD card issue is fairly common but constant SIM card lose and reboot is not. A factory reset is done from power off and "may" let you bypass whatever is causing the phone to fail. I don't know the factory reset key sequence but it should be easy to find online from a Google search on in your documentation. Really though, I think you've got a fatal hardware failure.