Yesterday, my collar worked fine. This evening, it didn't work at all. The collar charges and turns on just fine. Likewise, the transmitter charges just fine. The green light comes on whenever I press a button. Somehow, the signal seems to no longer be getting transmitted, received or both, like the two are somehow no longer in sync. The darn thing is in a padded case whenever it's not on my dog's neck. Of course, the warranty on it just expired a few months ago. This is a top of the line Pro 500 G3 purchased new in 2009. I'm more than a little irked that this happened but am hoping it's some simple deal someone here may know about that's not in the owner's manual. Anyone had experience with this?