ZyXEL NWA50AX Pro eth0 disconnecting and reconnecting periodically

I have a ZyXEL NWA50AX Pro. I installed the latest release and now am trying a snapshot build from last night (Feb 1, 2024). I am running it as a dumb AP. Initially the performance was stellar, but after some time it slows right down to a crawl. I checked the logs and see this, which seems to correlate with the slow downs:

Fri Feb  2 15:09:06 2024 kern.info kernel: [  909.612324] mtk_soc_eth 15100000.ethernet eth0: Link is Down
Fri Feb  2 15:09:06 2024 kern.info kernel: [  909.618991] br-lan: port 1(eth0) entered disabled state
Fri Feb  2 15:09:06 2024 daemon.notice netifd: Network device 'eth0' link is down
Fri Feb  2 15:09:11 2024 kern.info kernel: [  913.771887] mtk_soc_eth 15100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
Fri Feb  2 15:09:11 2024 kern.info kernel: [  913.780363] br-lan: port 1(eth0) entered blocking state
Fri Feb  2 15:09:11 2024 kern.info kernel: [  913.785611] br-lan: port 1(eth0) entered forwarding state
Fri Feb  2 15:09:11 2024 daemon.notice netifd: Network device 'eth0' link is up

I have tried changing out the network cable and will try connecting it to a different switch, but just wondering if anyone has seen anything similar. Note my switch can only handle 1Gbps. I am wondering if it's some sort of negotiation issue. I have the NWA50AX (non pro), and do not see these issues.

I found that if I disable auto-negotiation, and force 1000baseT/Full it stops disconnecting. For reference this is what I did:

ethtool -s eth0 autoneg off speed 1000 duplex full

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