Neo 2.2 help

[mjk729]

Hi, I'm using a v1 USA ps2 with both a gameshark 1.6 and 2.01 with the Neo 2.2 modchip installed. Now, everything was working ok the first week, the ps1 backups boot perfectly and the onlyPS2 CDR game I had Maximo, worked ok with the Gameshark swapping. Now, the PS2 refuses to boot any PS2 backup(freezes at Gameshark/loading game screen), yet the PS1 backups work ok. What gives? What can I do?

Thanks in advance