I recently updated from 6.0.0 to 6.1.0 on my OnePlus 3, and I notice that when I lock my screen, my SIM's network switches to "GSM only" (Settings -> Network & Internet -> Mobile network -> Advanced -> Preferred Network type) from the default option which has all options including LTE and WCDMA, which are needed for maintaining my connection on my Canadian network provider "Freedom Mobile". When I open the lock screen, I'm greeted with "No Service/Emergency Calls only", which means no one can reach me when my phone is on standby. If I unlock straight to the Mobile network settings app with the fingerprint scanner, I can witness the network mode changing from "GSM only" to "LTE/WCDMA/...". I'm not sure if this is some kind of power saving feature or something, but I need this sorted out so I can use 6.1.0 as my daily driver. Please help.