SS3 Keypad - Keeps Lighting Up in an Infinite Loop

Yes there is a motion sensor which is designed to light up as you approach it with your hand.  One of mine does this periodically where it comes on and off while watching tv.  It hasn't seemed to bother the battery life much so I've just lived with it, but if it's too excessive you might talk to SS about a replacement.  I think SS can control it's range via software because mine seems to do it a bit more often with the latest update.

A short term fix would be to turn on "power saver" mode which turns off the remote activation.

Well it turns out that when my TV is on, the keypad (right next to the TV hanging on the wall) turns on and off continueous.