It's possible the button contacts in your remote have deteriorated you can see if the remote is transmitting of using a phone camera there are YouTube videos that will show you how as for which buttons do what you might be able to find one on the Internet but I doubt there is anything to change the sensitivity to the remote signal or increase its power you might be able to find a generic programmable remote you could try.
It's possible the button contacts in your remote have deteriorated. You can see if the remote is transmitting of using a phone camera. There are YouTube videos that will show you how. As for which buttons do what you might be able to find one on the Internet but I doubt there is anything to change the sensitivity to the remote signal or increase its power. You might be able to find a generic programmable remote you could try.
Anon
January 2022