@Clive_A 

1. Does the port LED still come up as green?

- Yes

2. Reboot, it does not work?

- A reboot doesn't restore connectivity to the ethernet ports. I also attempting a factory reset a couple of times but the ethernet ports still fail to provide network connectivity. I noticed when I run a ping test from the computer connected to the SFP port to one of the computers connected to an ethernet port, there's no response. I get the request timeout message.

3. All RJ45 ports are stopped except for the SFP+, just confirm what you said.

- That is correct. All RJ45 ports have stopped providing network connectivity. My router can still see the devices connected to the switch, but those device can't can't connect to the network or receive an internet connection. I disconnected a few devices from the switch and connected them directly to the router and they worked just fine, so this confirms that my devices still work. When I reconnected the devices to the switch, they failed to work.

- Yes, only the SFP+ ports are working. There's a 10Gbps connection going from the router the one SFP port on the switch, and the second SFP port is connected directly to a computer (Mac Mini). The computer connected to the SFP+ port has full network and internet connectivity, as I have it setup as a file server/media server. 

4. Do you have VLAN on the switch? What IP do you get from the devices that are connected via RJ45?

- There are no VLANs setup on my network. All of the devices receive a private IP address given by the router (192.168.10.x).

  @Clive_A 

Can you let me know the specific IP address you got from the devices(RJ45)?

- The same IP address that was assigned to them when everything was still working. The IP addresses haven't changed.

Are you able to ping the gateway while they retain the private IP?

- No

- I've noticed that my devices will regain network connectivity, but only for a few seconds at a time and it appears to happen randomly. I was trying to get things working yesterday, and every so often my devices would regain network connectivity. It was very random though, and it wouldn't last long either. It was only for a few seconds. I had a Unifi switch connected to the TP-Link switch, so my Unifi Dream Machine Pro router would detect when the Unifi switch was connected and then disconnected again.

- Check the Dream Machine log below. The issue started happening yesterday at 4:56AM while I was asleep. The USW Flex Mini (switch) and U6-LR (access point) were directly connected to the TP-Link switch.

Are you able to ping the switch IP like the condition above?

- Yes. When I'm connected directly to the Dream Machine Pro, I can successfully ping the TP-Link switch's IP address.

I've got what seems to be the same issue this morning. After a scheduled reboot from controller at 4:30am, my sg3210x-m2 has lost connection. None if the LAN ports are functioning to get it or devices connected even though they do light up as connected and when in the console it shows the port go up when connected. 

Reboots solve nothing, factory reset using console solve nothing. Omada controller no longer sees it's online at all and I can not ping it or any devices on it. 

I don't have a SFP adapter to test. 

Frustrated as it's barely 2 months old. 

  @Clive_A 

Just an update, but it seems like my SG3210X-M2 switch is working properly again. I'm not sure what happened, but the only thing that's changed over the past few days is that the Dream Machine Pro and U6-LR access point received new firmware updates. I reconnected the U6-LR AP and USW Flex Mini switch back into the TP-Link switch and they both seem to be working properly again. I also re-connected a couple of computers directly into the switch again, and those both work as well.

It's strange because when the issue occurred a few days ago, none of the RJ45 ports worked. I rebooted the switch a few times and that didn't fix it. Then I did a couple of factory resets, and that didn't work either.

I just checked the Unifi firmware update history, and the last update was to the U6-LR AP over a month ago. The Dream Machine Pro received an update three months ago, and the USW Flex Mini switch has never received an update. It's strange that TP-Link SG3210X-M2 switch stopped functioning properly without any changes to my environment in over two months. Over the last two days, the Dream Machine Pro and U6-LR access point received firmware updates and today I noticed the RJ45 ports on the SG3210X-M2 switch were functioning properly again.

I guess the problem's been magically fixed for me (not sure how), until something else happens again.

  @Clive_A 

I was previously connecting directly to the switch to manage it. Last night I setup an Omada Controller and added the switch to it so I could manage it through that. Immediately, I noticed there was a pending firmware update. The firmware version for the switch was 1.0.1 Build 20231013 Rel.69747.

Why is this firmware update not available on the TP-Link support page for the switch? Will future updates only be available through the Omada controller, or will they be made available on the TP-Link site? Also, where can I find release notes for firmware update 1.0.1 Build 20231013 Rel.69747?

I never got mine working and have sent it in to tplink for warranty replacement. 

I was running omada controller on NAS, switch was connected to tplink ER707-m2 gateway. 

Mine specifically died when it did a scheduled reboot overnight at 4:30am, from then on ports wouldn't work.