[Solved] OpenWrt on MT7621/MT7615N devices with 5GHz problems

This topic/thread is getting rather long so a quick summary for those who reported unresolved problems with MT7621/MT7615 routers.

Pico w/ DIR-1960
1 picky WPA2 2.4Ghz IoT device with really low data activity

Cheddoleum w/ EA7500 v2
directory listings from an NFS server made from a Macbook Air Finder window just give me a spinner that goes on for an indeterminate time

Mentioned fixes by some users,
NB: Fixes may/may not be necessary since OpenWrt snapshots may contain fixes already.

trinilopez
FWIW, I'm running a Netgear R6700 v2 and changing from WPA3 to WPA2 only fixed this for me

Lucky1
try temperately turning off "Enable SYN-flood protection"
under Firewall>General Settings

Note: My personal testing has arinc9 release (no longer available, since incorporated into snapshots) with an uptime of 25 days ... on a D-Link DIR-878 rev.A1

Will resume testing snapshots soon, unless a new 22.03.0 stable release comes out.

EDIT: Since not all the arinc9's patches were integrated into 22.03.0 stable release, sticking with snapshots.

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