I get notifications from FlightRadar24 whenever a plane squawks 7600 or 7700. It happens a lot; I've received eight today. (It seems like more happen on weekends than on weekdays, probably because more GA pilots can fly on weekends.) The last two, however, are the same helicopter squawking 7600, about 40 minutes apart. This happens every few days, usually with 7600 but sometimes 7700. Normally it's an airplane, not a helicopter, but I don't think this is the first helicopter that's done it; I probably just see more airplanes because there are more planes in the air than helicopters, so it would be expected that most emergencies woutbe declared by planes.
Why do repeated emergencies like this happen? Does it mean that the radio failed, the pilot landed and thought (s)he had fixed it, then took off again, and the radio failed again?