The update to v2203.5 is update of the new diagnostics PC App only not firmware within the GS911 WiFi so it should work with the old legacy PC App as it did before, do you still have the old legacy App v2104.1 installed on the PC ?
USB connect/disconnect sounds suggest a W10 USB issue, when was the last W10 update ?, install of the old PC App would ensure Hexcode USB drivers are installed