Nighthawk M6 Pro Ethernet port

MR6110 Ethernet Port Drops After Firmware v43 Update (Wi-Fi Unaffected)

Detailed Description
After the latest firmware update (verMajor 43), the Ethernet port on my MR6110 no longer functions reliably. Devices connect for a few minutes, then drop, and the link cycles between connected and disconnected.

I expected the Ethernet port to provide a stable connection (as it did before this update). Instead, it repeatedly drops out, even when using a clean run and a known-good gigabit switch.

Steps to Reproduce

1. Connect MR6110 via Ethernet to a TP-Link SG105 gigabit switch (or directly to a laptop).
2. Device (laptop, Roku, etc.) initially connects and gets an IP.
3. Within 2–5 minutes, the Ethernet link drops.
4. Device attempts to reconnect, link reestablishes briefly, then drops again.

Expected vs. Actual Behavior

• Expected: Stable Ethernet connection at 100 Mbps or 1000 Mbps, as before the update.
• Actual: Ethernet port drops repeatedly. Wi-Fi continues to work fine.

Environment Details

• Device Model: Netgear Nighthawk MR6110 (AT&T variant)
• Firmware Version: v43 ("verMajor": 43 in model.json)
• Connection Type: LTE B14 + Band 2 CA
• Signal Quality: RSRP –86 dBm, SINR 16 dB
• Downstream Equipment: TP-Link SG105 (gigabit switch), Linksys E5350 (Fast Ethernet switch), Windows 10/11 laptops, Roku

Error Messages and Logs
No on-screen error messages, only Ethernet link drops.

From model.json:

"ethernetSpeed": "100M", "ethernetDrvEnable": true, "profileList": [ { "id": "1", "ethena": "On", "ethspeed": "1000Base-T" }, { "id": "2", "ethena": "On", "ethspeed": "2.5GBase-T" } ]

Indicates the hardware supports 100M/1000M/2.5G, but currently only negotiates 100M and drops regardless of setting.

Frequency and Timing

• Issue occurs every time Ethernet is used.
• Started immediately after firmware v43 update.
• Ethernet was stable on prior firmware.

Troubleshooting Steps Taken

• Forced MR6110 Ethernet to 100BASE-TX.
• Forced MR6110 Ethernet to 1000BASE-T.
• Tested direct laptop connections (short patch cable).
• Tested with TP-Link SG105 switch.
• Tested with Linksys E5350 switch.
• Restarted devices and MR6110.
• All result in the same drop behavior.

Additional Context

• Wi-Fi performance remains normal (stable at 50–120 Mbps).
• The issue affects all downstream devices, not just one.
• Multiple users online are reporting similar Ethernet failures post-update (Reddit, Netgear forums).