MX95 WAN 1 Connectivity Issue – Seeking Insight

[CP-Net-Eng]

Hello Meraki Community,

We're experiencing a recurring issue with our MX95 that I’m hoping someone can shed light on.
Setup Overview:
• MX95 connected via WAN 1 to a multi-gig port on our ISP-provided cable modem.
• WAN 2 is connected to the same modem via a 1 Gbps port as a backup.
Issue Description: Periodically, the WAN 1 connection drops completely. During these outages:
• The MX95 remains powered but loses internet connectivity.
• After 8 hours, the MX95 reboots on its own and the connection is restored.
• Alternatively, manually power cycling either the MX95 or the cable modem immediately restores connectivity.

• Firmware has been updated to the latest stable and also the stable canidate. 
Additional Notes:
• The ISP modem has already been replaced, ruling out hardware failure on that end.
• When WAN 2 is active (1 Gbps port), it remains stable and does not experience the same dropouts.
• The issue appears isolated to WAN 1 when connected to the multi-gig port.
Has anyone encountered similar behavior with the MX95 or multi-gig WAN ports? Could this be a firmware issue, port negotiation problem, or something else entirely?
Any insights or suggestions would be greatly appreciated.

Best regards,
CP

[alemabrahao]

If WAN 2 is working without problems, I suggest you open a support case, as you will probably need to RMA the device.

[GIdenJoe]

It is also important that WAN2 is on a different subnet than WAN1 since otherwise you could have weird routing issues.

[CP-Net-Eng]

@GIdenJoe The normal configuration will not have wan2 at all, it was just plugged in to see if it went down the same time that wan1 did so we could rule out if it was the ISP losing connection or not. 

I guess I was more wondering if anyone else has had issues with multi gig uplinks and the mx95. 

[PhilipDAth]

It is working fine for one of my customers (actually, this is an MX105 now I double check it).