Hi, hope everyone is healthy and working!   My Company is currently on the final stages of our Meraki deployment.   We are currently using different brands and flavors (Mostly 10Gbps. Cisco, HP, Other not so hot brands) of the SFP modules between the MS hardware. A lot of out topology is currently daisy chained, the final stage of this project is to deploy newly installed fiber so our topology will look like so:                                             The problem we are experiencing at the moment, is that randomly switches will go offline, and we have to physically power cycle them (which makes me very nervous as this is very expensive equipment) mostly every time this happens. I understand that non-meraki SFP modules can result in CRC errors, or "issues" per the meraki Engineers I have spoken to. However, I have a feeling it could be related to VLAN, or other types of configurations, we may have missed or performed incorrectly. The following is my Addressing & VLANS conf:   We are currently using VLAN 1 on all fiber ports as native VLAN, I understand this is not a Best Practice, however could this be causing the switches to randomly turn "orange" and go offline, or intermittent? Also, sometimes a sw may go down, but the downstream switches and APs are still "Green" is this a common occurrence?   This is a real time snapshot of out topology (We are not using L3 interfaces, or static routes as of now):     Please let me know if there is any other context, relevant to troubleshooting this, that I might have missed.   I appreciate any feedback. Thank you !!   Jaime.   EDIT: Including meraki dashboard "Switch Settings" page displaying Root Bridge configuration. Only the MX250 is providing DHCP Service, none of the switches are serving DHCP, static or L3 routes.     ... View more