I know its not the battery pack because weve even tried sitting them on the floor and, go figure, one or the other still randomly shuts off after only about thirty seconds or so. The router is the only thing I have in the vicinity and its been the exact same for several months now and this problem came out of nowhere. There are no other new wireless devices or anything else around. Ill try changing the router settings anyways tho and see if it helps, otherwise its time to operate....