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Can't connect to mobile network
Hey guys, first post and I'm pretty fed up. Yesterday my N4 suddenly lost signal. Not just a data connection but all network connection save for wifi. This happens really rarely (bought my device from Google in March and it's happened maybe 5 times since then) and usually a reboot fixes it. Upon reboot, N4 got stuck in an endless circles animation loop. Eventually I had had enough of that so I shut it off and attempted to reboot again. I did this about 3 or 4 times, getting stuck in the circles animation each time until my phone booted normally. Ever since then my network connection is short-lived upon boot. I think it must have something to do with the phone being awake, because it held connection being unused overnight. However upon using the phone for a bit (no data connection because I was on wifi but sending/receiving a few texts) I lost the connection again. Sometimes I find that the phone displays full bars, but I get "stuck" trying to make a call. The phone reads "dialing" but never connects, and will read "ending call" indefinitely when I try to hang up. I'll play around with the phone for a bit when it still hasn't "hung up" the call. It will be in this state whenever I enter the dialer. I apparently was not sending or receiving texts at these times either.
I've been trying to figure this out for some time. I've found out about the *#*#4636#*#* menu, and discovered I can only change the preferred network type sometimes and that is only a temporary solution. I switch the N4 to GSM only from "unknown" and this seems to fix network connectivity for a bit. Once I lose it, the preferred network type is "unknown" again and even though I can select a different option from the drop-down that new option doesn't stick. It reverts to "unknown" immediately. Below are some screenshots of not working connectivity.
I've tried booting in safe mode. Connection issues persist. Have yet to do a factory reset but I'm really trying not to do that. N4 is completely stock running 4.4.2.
Sorry for the novel but I'm really trying to get this fixed. Thanks.