I tried to recognize a pattern, and for what I see is that it only occurs at hot days, at the hottest period of the day. The 9VDC power source is plugged into a socket which is not in direct sunlight but in a half-open shed that heats up very quick when there is enough sunshine.
I am not really familiar with power supplies heating up too much, but my guess is that the 9VDC adapter gets too warm and cannot supply enough power to the Smart Implant (can this even be the case?). Unfortunately I am not at home during day time, so I cannot test it right now. My next step would then be to replace the power supply with a 12VDC or higher one, and try to put it in a colder position.
