I realize this is an old thread, but I have the same problem with TWO of these transmitters. One is from a G90 I bought new when they first came out. The door started getting harder and harder to open. I had to start opening the door with a screwdriver and then eventually the door just stopped opening. I had to muscle it open and it now won't stay closed by itself. I need to use a ziptie or rubber band to keep it closed.
I recently bought a g50 and it started showing signs of the same problems right away. I need a screw driver to open the door. Is there a fix for this? Possibly a replacement door? I was thinking about buying a Helix, but I've owned two line6 products in my life and they've both S&/!T the bed.