Many things can cause false motion sensor alerts, from a spider crawling across the face of the device to just a change in temperature. Those are very common, And are the reason that most dedicated security systems require an alert from three different motion sensors before considering it “real.”
FAQ: False positives on motion sensors
The minimote is a different issue. That’s very rare. It could be just some glitch in the cloud database, that happens sometimes.
It could also be local interference. You didn’t say what country you are in, but I’m guessing North America since you mentioned a GE device. The most common interference in that region is from an old baby monitor, walkie-talkie, or cordless phone. It’s also possible to get interference in this frequency range from some drones. They aren’t technically supposed to be able to cause that interference under FAA rules ( Because it’s the same frequency band that ambulances broadcast on), but there are some Chinese-made models which can, and there have been a few known cases, one from a community member who owned the drone himself and had brought it into the house for charging.
Mostly you just have to watch and see and see if the problem occurs. If it does, then it’s time for some detective work. 