3 Weeks ago, Meraki pushed out firmware updates to our switches, upgrading from MS 14.33.1 to MS 15.22 for our MS210's and CS 15.21.1 for our MS390's. Since the second the update was pushed the nightmare began and is still on-going.  The update failed on 2 of our switches and sent the remainder of them into a non-stop reboot cycle. After working with Meraki, we rolled back the update and the issues were still present along with now, many POE Overload issues on multiple ports. Mind you, none of these issues existed before the firmware push. We attempted the update again and the same 2 switches would not update, and the rest continued on a perpetual reboot cycle.  After over a week of troubleshooting, they RMA'ed the 2 that would not update. We replaced the switches and ran the updates...They updated, time to celebrate, right? No, the stacks continued to go offline/on-line. So, we rolled back the update for a 3rd time. We also did some research and found that some folks were complaining about STP Loop Guard can be known to cause issues. We found this enabled on 2 uplinks, disabled and finally, all was well. Meraki suggested now that things were stable, to run the update again. We did, and they updated and 10 min later all started going offline again. This morning we rolled back the update for the 4th time, still having POE overload issues and 1 stack is down, that we can't manually reboot right now because we have an event going on in the office and a manual reboot would take down the lights....again. For 3 weeks we have been getting the stink eye from users because every time these switches go down, the iOT lighting in the office goes down with them.  Over the past 3 weeks our offices have been a horror movie because batches of lights dim /go down/cycle and come back at random with the switches constantly cycling. Has anyone else experienced these issues with the recent update on the MS390s? This has been a nightmare and I just want to wake up.  ... View more