Remote control button failure
What should I do if it is insensitive?
The old master taught me a trick,
Repaired in 2 minutes,
The method is very simple

Quick Remote Control Button Fix in 2 Minutes

Remove the back cover of the remote.
Locate the problematic button.
Gently press down on the contact point underneath the button a few times with a pencil or other sharp object.
This usually clears any dirt or oxidation, restoring the button's sensitivity.
Replace the back cover, and your remote should be working again!