I have 2 of the 4CH Pro R2's , both have CH1 switching on by itself at wee hours in the night or various other times when those times were never programmed in and maybe the eprom just never got cleared out properly. And now my first one has both CH1 and CH2 triggering for no reason. Both are on a stable 12 Vdc supplies (i.e. Solar system battery) .
Just submitted a trouble ticket and waiting for response.
I have several Sonoff 4ch pro R2d I had the same problems: on/off by itself randomly. I pressed the clear RF433c buttom (inside) for several seconds until all green light turned off and sice there, everything smooth