I just recently purchased an Amplifi 150 and am having this same issue with my Galaxy tablet. Turning off the WiFi does in fact solve the problem. I'm surprised in this day and age that if Line 6 is aware of the problem they haven't sorted it after all this time. I have several Bluetooth enabled devices from phones to speakers and even Bluetooth wireless for my guitar which all work fine. I really like the amp and app for practicing and noodling but not having to turn off WiFi, close all other apps and be 10 feet or less from it. Hopefully line 6 fixes this through an update at some point.