@Mr_IT_Guy- Upgraded my MS350 stacks to 10.14 a few weeks back and so far they have been solid. The original issue was nmap scan's would cause some switches in a MS350 stack to become unreachable, they would also no longer forward traffic. The only way to bring the switch back online was to reboot it.   Here is the reported fix from the Meraki engineering team.   "The fix was to implement a rate-limiter in hardware to avoid the CPU from being hampered by the scans." ... View more