I'm starting to wonder if this new holder I got for my iPad is giving the interference detection signals being metal? Also probably the iPad as well being metal base?
That shouldn't be a problem. A lot of guys use Ipads, too. I have a metal holder and I use an Ipad Mini 2 and all works well. The only time I've gotten the interference warning was when I was flying near a row of houses along the beach. A LOT of wifi!
Interference warning usually has to do with the compass. I got that on the floor of the building where I work which went away when I put the AC on a table. Likely rebars in the concrete causing it.
Beach sand can contain ferrous material which may have been the real problem at the beach than Wi-Fi. Radio signal issues would say "weak signal"