Hi! I am getting a bug whereby I see a constant notification popping up with "USB connector disconnected". I have not attached any device via the USB port. So, there is no reason that notification should pop up. It comes on and off like a blinker.
My S9 FE is also on 6.0 OS and I'm not facing any connectivity issues. So we can conclude it is not a system-wide issue but something specific to your tab.