I have six of Lutron's most basic motion sensor switches. They worked well for two years until a few days ago when I notice one started to get triggered without a motion (I can see the light and hear the click under my bedroom door). It still works properly otherwise. Initially I thought the self triggers were random. Then I found out it triggers itself EXACTLY EVERY HOUR! I came here more for curiosity than help; how could this happen? Maybe some Lutron engineers will read my post and explain it to me. Anyway thanks for reading and I look forward to any explanations!