I have exactly the same problem ! I'm desperate to find a solution. I hope that there is a way to downgrade to 6.0
Nobody know how to downgrade to 6.0? Each time, I reboot, go to install then find.synology.com and redo an install + migrate my data and 1 day after, the dsm is crashing but services like PLEX are still up!
How I'm suppose to execute SSH command, I though that SSH service was not running by default since the 6.0?