Not sure, I haven't had that issue before, but I doubt it has anything to do with this S-OFF method though. You should check the CM9 forum and see if anyone had a similar issue.
Well I'm from the G1 days when certain radios weren't compatible with certain hboots and you *would* brick your device using this radio with that hboot so I wondered if the 1.45.1313 hboot had compatibility issues lol.
Sent from my myTouch_4G_Slide using XDA