I recall that when I purchased a second radio controller for my
I2 and tried to set it up as a slave I had a hell of a time getting them synced. After about 7 tries the radios finally got on the same page. About a month later it occurred to me that at the time I was sitting practically right on top of my dual-band WiFi router, which simultaneously transmits in 2.4 and 5.8Ghz - the same frequency bands as the radio controllers. I cannot help but wonder if that had anything to do with it.
Only once have I gotten the radio interference message while flying but it was disconcerting enough for me to purchase a range-extending panel antenna for my controller, with the hope of being able to simply over-power the signals that are coming from the routers and wireless devices that are everywhere now.
I haven't installed the panel antenna yet, and I'll probably need a good shot of whiskey before i open up my controller for the install. I'm still debating whether I want to risk fooling with the controller when, generally, I don't really have problems.
ALSO, I have to wonder if using my cellphone as a hotspot, in order to use the mapping program while I'm flying (that third view on the tablet), actually creates a rare problem.