Archer C50 v4 Mac80211 Loses Internet Access after 20'+ Away from Router But Maintains Connection

Installing and Using OpenWrt Network and Wireless Configuration
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OpenWrt version's 19.07.5 is out since a few days, EDIT: The issue is not fixed in the new release.

I can confirm mtk_soc_eth.c 's bug is fixed ( * Fix regression in 19.07.4 causing transmit timeout and packet loss on mt7620 devices)