Been a couple of years getting equainted with MH (Moving heads) and other none dimmer lamps. We've had a number of occasions when the lamp(s) went berserk! They were changed out and later tested. I found that every "Rogue" lamp upon testing was in fact OK! two things: Most faults were in the DMX cabling (did we always use a terminator?). And on a couple of occasions found a lamp on the floor had been mysteriously changed to 'Master' mode. Now here is the thing: Those Wireless DMX dongles can work both ways. IE if the lamp is producing 'master' signals and the "Reciever" sees no DMX input it will then TRANSMIT. Ouch! Every other wireles dongle will 'see' two signals and the whole place go nuts. Moral. Check in right mode. Dont use wireless dongles unless absolutely necessary. And 1st thing when seeing a problem, check, replace DMX cabling.
Probably old hat to more more exprienced techs. But hope this heps newbies