have the same Problem.
after the Update the Uni cant connect to my WLAN. After 30 seconds it turns the AP on and is reachable over the gui.
Soft and Hard Reset wont help with the problem.
My other Shelly Uni has the same Firmware (3 months old) and runs without Problems.
I tried to downgrade this guy with HFS but it doesnt connect my HFS Server.
Any Ideas ?