I doubt the issue is Bluetooth conflicts. I can’t remember for sure but since BT V3-ish BT is made to handle multiple clients well.
My own observations with xdrip+ and the G5 is running both receiver and xdrip on your phone in parallel leads to increased battery drain, you are feeding two devices from the single transmitter. Supporting two device simply drains the batteries in the transmitter more rapidly than a single BT connection.
Dexcom developers are wimps, hahaha-just teasing them, a little-they have the FDA & and you name the alphabet soup haranging them constantly.
When they submit the system for approval a list of supported devices for the software & hardware sides, needs to be included. That means Dexcom kinda is forced to allow only a tiny subset of devices.
Xdrip+ has no such restrictions. I’ve been thrilled with xdrip since getting my CGM earlier this year. But i did run transmitter on two simultaneous BT connections, the Dex receiver and my Moto 5e (one with huge 5000ma battery for almost 48hrs between charges… oops OT). Running that way i did track battery drain. I then ran on just the phone and drain dramatically reduced.
Anyway that’s the take I’ve gleaned online searching to figure out what numbers mean a dead battery.