You can install an H.265 codec free of charge if you install the K-lite Codec pack.
https://www.codecguide.com/download_kl.htm
Or.... Media player codec pack plus
https://www.mediaplayercodecpack.com/plus/
...or if you prefer the genuine...
Live and learn - she seemed like a nice lady and tourist with a massively heavy suitcase. As I am moving it, she says, "And don't tell anyone what you are doing or where you are taking me, they have all been out to kill me and they are after me...
A fix.....NO.
Replace the gimbal, Plenty of good info on how to do it out there. it gets done quite a bit actually. Better get your DJI part while the getting is good!
Viagra? LOL!
Sorry. Try a google search and YT search for any teardown repairs on the RC Pro related to limp/floppy sticks. You can't be the first to be so afflicted.