I never heard about channel mapping on LE. You had a working system before your microSD died, so I think it's not a driver issue.
Because you have another HiFIBerry card, we can rule out a HiFiBerry firmware issue.
On the other hand, the RPi has it's own firmware, too. LE installs the right firmware, but maybe something broke while your microSD died.
My suggestion: Take another microSD, install Raspbian, and if Raspbian also has channel issues, try different RPi firmware on Raspbian.
I understand if this openelec build is a POS, but am I doing something wrong, here?
Yeah, you did something wrong, because this forum is about LE, not OE. So please stop asking for OE things.
This is unusual, and I suggest to provide a link to a complete kodi.log.
To rule out a hardware defect, you can also try a different OS, like Raspbian.
Always use the search function before starting a new thread: Click.
OK, then I don't have a clue how to restore that. The cache folders content is all, what can be deleted without a doubt.
This one:
LibreELEC-RPi4.arm-9.80-nightly-20201106-9862821.img.gz
kaputnik Thanks. Dev's will have a look at this, soon (maybe wrong RPi4B compiler flag).
You haven't described which folders content you've been deleted. If you delete the content of /storage/.cache, then it maybe updates time.
Just on GUI, or on terminal (ls -l) as well?
Sad to hear. 
Because Pulse Audio is mainly for Bluetooth on LE, you could try some Bluetooth add-on's. Maybe one of them is able to store the volume setting.
Read here about TVDB scraper.
Because it's a different issue, and the original issue has been solved, I close this thread.
Yeah, Docker is your solution: Click.
You could check whether the network controller chip (?) is supported by Linux, before you buy.
PS: I've seen Linux support at your link, so this part is OK. 
There is a chance, but no guarantee, if you can't compile your own LE. The best strategy is to start with a regular Linux, like Ubuntu, and then go for the detected kernel modules on LE.
Good feature request, I moved it to the right sub-forum.
Don't worry about it, you'll get a lot of 'smart' answers here.
Smart means, we take every single word serious.
Hi, I wanted to ask if this version of libreelec is 100% stable , thank for the precious time for whoever responds
No. For such software you have to pay millions of $ to get a 100% stability guarantee. 
