I have 2 HS200s that run on daily on/off schedules. They have been working flawlessly. All of sudden, one them has been turning on by itself. Furthermore, there is no consistent time. For example it is schedule to turn on at 10 AM and then off at sunset. It follows the off schedule consistently, but sometimes at turns back on before I go to bed and then sometimes it is on when I check it in the morning. Any thoughts on what the causes might be?