My 4channel rev 2 had. An issue whereby all the switches got stuck on when my router was changed. To resolve I powered down and back on. It now will not go into pair mode and none of the switches will turn the channels on or off manually. The blue WiFi led goes on solid whe. Starting then turns off and blinks very infrequently. Holding button 4 does not put it into WiFi mode. Any ideas what's occurin.