Default SentinelRom issues (no notifications and no 4G)

Whenever I use Apps like Facebook Messenger or Snapchat, my phone (SentinelRom 6.0, CM 11.0) doesn't notify me. No matter how much I check the settings, I can't find the options to turn notifications on.

Another issue is that I can't turn on 4G either. It can't find a 4G signal. Whereas normal 3G works just fine. Anyone experienced similar issues?

edit: doing some testing, it seems I do get notifications after immediately turning off screen now. Gonna try to test it after half an hour screen sleep.

edit 2: did more testing with screen shut down for an hour. Got notifications. Maybe it was because I had low battery that I didn't receive any notifications yesterday.