SImilar issues with my usb-c dock on 2019 macbook pro.
It will work without issue after SMC reset while plugged in, when i go to work and come back home to plug it back into my dock
it works for a few minutes, then starts disconnecting, then recconects without power, and at the end that USB port doesnt work anymore, until i perform an SMC reset.. Im doing multiple SMC resets per day apple...
Foosec
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How has this not been fixed yet Apple, **** youd think you would atleast give us a good way to downgrade.
Ive found a fix for my problems, it seems MacOS became a bit more touchy on unstable power, perhaps it doesn't like my docks power supply, im not sure.
So i just power the mac with a seperate power supply while docked, no more issues.
Hope this helps some of you aswell.