I just encountered this problem tonight. I have never had this happen before and have been using this setup with no changes for quite sometime.
I'm currently using FoxFi to create a hotspot on my bionic to use at home. A few minutes pass after I start browsing the internet on my cpu I notice I'm suddenly disconnected. I go to check my phone press the on/off button to cut on the screen, it does, and there's no connection. As I begin to enter my password to unlock my phone the 4G symbol in gray pops up and begins to connect. This has continued to happen multiple times now (10 or more) in the last 20min. Here's a breakdown of what's taking place:
hotspot is turned on
connect to internet via foxfi hotspot
lose connection inexplicably
turn on phones screen to check status, 4G symbol pops up in gray instantly and begins to connect
It's almost like the a power saving feature or something is kicking on and turning the 4G off since the screen isn't on.
Any idea what could be causing this?