[Q] Dialer Battery Drain topic

I have an HTC Droid DNA on Verizon running Android 4.4.2 (for a while now) and it's been pretty solid until about two weeks ago. All of a sudden it has started eating battery like mad, and the battery info says that the dialer or android system are the largest users of battery. I'm talking like full charge in the morning to dead by mid afternoon PLUGGED IN TO MY COMPUTER. I'm down 10% battery in the last 1.5 hours with the phone charging. The phone is in global mode, the location is set to "battery saving," I have good signal here (East Sacramento, Ca). I found some old threads on similar battery issues and read through them, tried what they recommended. I reset the cache partition first, no dice. I did a factory reset, and that seemed to work for a few days, but now the problem is back. I can't reset every few freaking days or my life will be a constant loop of reentering passwords. Could this be some sort of virus with a really good rootkit? I'm at my wit's end. Anybody know what this might be? I'd appreciate any help y'all can offer. Thanks.