Nexus 5 doesn't wake up from Deepsleep

Hi everyone!

I installed CM12 on my Nexus 5 two month ago and it works fine. But I have the problem that it doesn't react when I press the powerbutton to wake it up from deepsleep mode.
Then I could only reboot it.
I changed the "network type" in the settings to "3G" because my provider only supports it and I thought it could solve my problem.

But it also hangs up the phone anymore....

I adapted the settings of the phone in the following way:

- Installed "Apex Launcher" as the default one
- Installed Klear Kat CM12 as Theme
- Additional Apps are: Greenify and SD Maid

I just tried the following steps to fix the problem:

1 . Installed another Launcher instead of "Apex Launcher" ---> I had the problem anymore with the other Launcher

2. Installed Open Gapps "nano" instead of "micro" ---> it ran without any crashes of the phone for a period of time. But now I have the problem again....

3. I wiped "cache" and "dalvik cache" again in TWRP --> System was clean and ran for a while. But after a period of time the problam "came back"

I have no idea anymore. It's suspect that I only have the problem when I'm on a move.
When I'm at home in my Wifi I doesn't have any problems with the phone to wake it up from deepsleep.

Lastly I installed CM13 and had done an Fullwipe before... But I've the problem anymore :(....

I've the feeling that the phone looses it's reception and then the Launcher hangs and can't get up of his own....

I hope someone of you could help me with my problem and give any good ideas ;) :)!

Thanks alot, matze24

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