Moving the IR Transmitter

Moved our IR transmitter for our MX-600 RF Universal Remote from across the room pointing to the stereo cabinet to actually inside the stereo cabinet. I did this because it wasn't quite strong enough where it was to work everything. Tested it out and it worked fine, that is until later in the night when my wife went to bed and tried to use it. For some reason it just stopped working! I tried adjusting it but nothing seemed to work. Talk about frustrating!