[Q] signal proble? :S

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my defy sometimes lost the signal and GPRS,
especially after gamming :S
and every time while signal is gone,
the signal icon shown on status bar is freezed:S
i mean.. it shows full signal but no signal in fact

its so annoying that it make me miss many calls.....
i rely need somebody's help orz
what should i do?
im using cm7 by quarx and i tried to reflash cm7 before, but not works :S

I have experienced the problem when I first flashed CM7. After lot of frustration, I found that the sim card dose not fit snugly in the sim card slot. And after a drop, the sim card had moved from the contact. Removing the battery and setting the sim card properly solved the problem for me. Hope this helps. Another thing you might look at is the setting the right base band. And also select the proper network type in the test menu [dial *#*#4636#*#* and go into phone information and scroll down.] Sometimes this gets reset to WCDMA