I replaced our cisco core / access switches with meraki MS-350s (core) and MS-225. The MS-225s are a 5 stack and a 6 stack of 48 port for access switches. The MS-350s are a 6 stack using 10Ge fiber uplinks to the access stacks and netapp/vcenter. The copper and fiber port channels to the netapp had major issues and would frequently go into designated > disabled and back to disabled > designated - this caused major network outages. I have since removed all port channels to the netapp /vcenter which has resolved that particular issue. I have noticed that a switch in the core stack drops 66% of pings - just one switch , all the others are fine - the core stack is on a /28 subnet with all switches using the same dns and default route. I replaced the switch that was dropping pings and now a different switch in the stack drops pings but the original one responds fine. I also see in the logs the core stack ports are doing the designated > disabled disabled > designated dance all day and night - even switch ports that are disabled - I also see a disabled port being flagged as backup > designated designated > backup - all these issues started when I replaced the cisco core - it was fine before that - anyone experience similar issues?