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Thinking about this further, and we have had ground loop issues in the past there. They also just had a power outage (I was told not a surge) that was suspect in frying one of their computers. Everything else was fine so maybe just a coincidence. And for the record, none of my equipment was plugged in. I always pack it up after every practice. Definitely going to try this in a different space as well.

I think the power amp is not connected to earth and by this is able to shift ground with power. Check the rehearsal room's power sockets for a proper earth connection and all power cables for proper ground connection.

I just fixed mine: Follow these steps Unplug the USB cable from both the back of your Helix and the computer. Turn your Helix/HX device off and turn back on. It should say Boot failure on its screen. Reconnect the USB cable to your Helix/HX device to the computer. Download firmware version 3.7 from line6 and save it to your computer. Download, install, and launch the latest version of Line 6 Updater if you don't already have version 1.28 installed. (In a failure state, the device will not connect to HX Edit but Updater CAN see it.) Select your device (it should show up in the app) and try updating to the latest firmware by selecting the option that says "Select local file" NOT by selection the 3.7 or 3.6 etc. options Mine worked fine after that. The feedbacker is awesome, only thing I have messed with so far.

I got a really great pop punk tone by accident yesterday while trying to get a crunch tone. The signal chain: LA compressor 808 Screamer Gain: 5-6 Tone: 6 Level 8 US Double Nrm Gain 9.5 Bass 4.5 Mid 6 Treble 7 Presence 7 IR Reverb Plate Mix 15% Really great with single coil/split humbuckers. Wouldn't recommend for leads/riffs