Casual signal drop on Droid RAZR MAXX

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Hey guys,
I realized that sometimes the phone is not able to receive calls. To make sure I tried calling my phone with another phone and at the same time was looking at the screen, suddenly saw that the signal bar dropped down to ZERO so it didn't even ring. (FYI I'm on a GSM carrier)

 

[HNNNNNGHHH]

May be a malfunctioning radio or a problem caused by a recent OS update, although I wouldn't be too sure.

If your phone is rooted, try flashing a newer radio to your device: List of ROM's / RECOVERIES / RADIOS / TWEAKS-- for the Droid RAZR and RAZR MAXX - xda-developers

**MAKE A NANDROID BACKUP FIRST OR HAVE A BACKUP OF YOUR CURRENT RADIO READY**