LG Marquee previously recognized SD Card, now will not recognize any.

[eggbabies]

I have a LG Marquee on Boost Mobile. I got the phone used, and the 2GB microSD card that came stock seems to be bad, it won't read in the phone or my computer. I have an 8GB microSD card and also a 32GB SanDisk microSD card. I have reformatted both in FAT32. I have tried both in the phone, and previously it would recognize neither card. Recently I re-inserted the 32GB card and the phone recognized it, I was able to use the camera and other apps. It lasted for about three days, but on a reboot the card again unmounted and I got the "Removed sd card. Please insert a new one" error. Both the 32GB and the 8GB cards still show in my computer, and I have since reformatted both (in FAT32) and done a factory reset on the phone. It still won't recognize either. Any ideas? I know both the cards and the phone have the potential to work properly.