Yes it's RF "interference". 2.4GHz is massively over-used by millions of IoT devices - including our beloved speedlites. You should see what my spectrum analyzer shows! Optical is a solution, but with limitations of course. In studio I've convert...
My "solution" is that I'm going to continuous lighting. No more speedlites unless I'm out in the wilderness away from all electronics. I don't have the words to describe how frustrating this is.
The fact that the connection drops upon interference is fine with me... AS LONG AS THE UNIT AUTOMATICALLY RESETS AND RECONNECTS. To me, this is a software issue which should be within the power of the smart people at Canon to remedy. Apparently no...
Since I own a spectrum analyzer I figured why not... so I can say with confidence that 2.4GHz is crowded like Interstate 90 in Chicago at rush hour. This is true even after I disabled the 2.4GHz band on my house router. Some portable (not cellular...