What happened to me: after planned power maintenance  more than ten  Meraki MS220-8P switches (firmware 11.20) within the same network never came back in terms of management. The whole network was unstable. We have mostly Meraki but also Cisco Small Business there. In order to stabilize the network I had to power off of of stack member (Mearki MS410-16). We are running L3 on this stack. After this action we could finally access Cisco SB via SSH. Meraki MS220-8P switches are red in Meraki dashboard but seem to work as switches but every 5 minutes devices connected to them facing 20-60% percent of packet loss. Powering them down and up didn't help. Meraki advise:  perform a factory reset on all MS220-8P switches.  Topology: 12xMS220---2xMS410---CiscoSmallBusiness---WAN-Router ... View more