2.4 GHz no internet after a few hours, but 5 ghz is fine, MT7621 driver issue?

Rollback to 19?
Re-purpose it.
Buy a more capable device.
Reload factory firmware.
Start over.

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The issue isn't really solved but It's solved in my house. The router in question is collecting dust and I've gone back to an older router.

I see that there is a new version of the OpenWRT for my router I'll give that a shot and report back.

FYI. I've the same issue, have you found anything useful? Thanks!

I did upgrade and it seemed to stay up longer, but i didn't have my laptop set up to do the ping test to actually test if it stays up.