T-Mobile Signal on AT&T Galaxy Note

Well I posted this in the Galaxy Note forums but I've had no response. So I thought I'd post it where the whole world can see. I'm on ICS ( http://forum.xda-developers.com/showthread.php?t=1661772 ), and I have really really REALLY crappy signal and data. Usually in have like 3 bars everywhere but now I barely get 1 or sometimes none. Also, it shows an H on top of the signal bar which means HSPA+ but its really 2G. I've flashed all the modems (T989 and Blaze ICS) but it just "turns off" my signal. What I mean by that is that there's an X over my signal no matter what I do. I have to factory reset and stuff in order for it to come back. So...can anyone help me? Thanks .

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