Signal strength drops to null - Galaxy S 4 Q&A, Help & Troubleshooting

Hello folks,
i have a problem with my galaxy s4. I am using CM11 and recently updated from M9 to M10. After this update the signal strength drops really bad and i cannot call. I returned to M9 and the problem is gone. I googled the problem but couldn't find anything. The newest nightlys don't cure this bug. Has someone experienced the same or/and has a cure for this?
Thanks for reading,
somasu

On stock 4.4.2 GNG8 there is same problem. When go to area with poor coverage sometimes phone radio hangs - zero bars (but no "no signal"), i cannot receive calls or connect to internet. I read that this is bug in android 4.4.2.

So i'll answer my own Questions by myself. After wiping Cache and Data and flashing CM11 M12 the problems are gone. I would recommend to do the same.

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