[Q] Cell signal shuts off when i start using my phone

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http://forum.xda-developers.com – Hi all, I have a strange issue with my N4. When I switch the screen on and start playing with the phone the cell signal completely shuts off after a few seconds, if I stop using it it will come back on. The other radios continue to work fine. The battery in my phone is terrible and only lasts a few hours, would it be possible that it is the issue? Has anyone else experienced anything similar? I've been running standard CM11 M releases and have only recently started having this issue. (HowTos)