PSP crashes all the time!!!!!

Ok so I had a different PSP a while back. PSP-1001, TA-081 motherboard. I got a LED Pandora battery and MMS from pandorasales.com. I went from OFW 6.20 to CFW 4.01 M33 to 5.00 M33 to 5.50 GEN-D3. I only had it for about a week and in that time I had no problems except for when I did something stupid lol... But after about a week I fried the mobo. So I got another one from eBay. It's the exact same model, same mobo and everything. I set it up the exact same way but I started with the OFW it came with which was like 2.70. Now the PSP crashes all the ****ing time. I do use cxmb and .ctf themes but it still crashes when I use the normal xmb too. Usually it crashes when I enter a menu icon or a game/homebrew app. It just freezes and then shuts off. Is there anything I can do? Thanks!