Devialet 220 remote control issue

[Flashman]

I had the same issue, on multiple remotes (Expert 140/210 Pro) during last 2 years.
I believe that YouTube movie (https://youtu.be/hRwBMqYedZQ) is made using an older remote design. Movement sensor now is not mechanical, but it is optical.
I detect the issue cause, and also manage to improve the situation. Still, it is not perfect, but it is better.

There are two causes, both relating to the knob (please see the attached picture):
- [main] Bad manufacturing quality and finishing for rubber ring (burrs). Also, possible dent due to long time storage.
- [secondary] Weak seal/safety for screwing plastic ring on knob.

Steps to perform:

1. Dismount the knob from the remote (4 screws with metal rings).
   
2. Remove safety (yellow scotch).
   
3. Unscrew the plastic ring from the knob. Don't pull it, but UNSCREW it!
   
4. Remove the rubber ring from the knob. Make sure to remember the rubber ring position (it is not symmetrical)!
   
5. Perform finishing and cleaning of plastic ring, leaving a smooth edge and no burrs.
   
6. Perform finishing and cleaning of rubber ring, leaving a smooth edge and no burrs.
   
7. Mount the rubber ring back on the knob. Make sure it is in the same position (it is not symmetrical)!
   
8. Screw the plastic ring back on the knob. Don't push it, but SCREW it! Make sure it's tight.
   
9. Put a new safety (scotch), but much bigger than the original one (I used 4 pieces).
   
10. Mount the knob back (4 screws with metal rings). Optional: grease the contact area between screws and metal rings. Make sure you don't grease the exterior or the metal rings!
    
11. Make sure everything you touched here above is clean.
    

I didn't manage to fix the dent due to long time storage...

This may help!  Thanks for the very clear directions!