4/25-28th/2026 - Root Cause Found - UDM Pro SE Hardware Revision Issue - New Router Arriving Tuesday

For everyone who's been riding the up-and-down rollercoaster with me -- I finally have a clear answer on why this has been so unstable, and a real fix on the way.

What's actually happening: My current router (Ubiquiti UDM Pro SE) has a known hardware-level bug where all the wired LAN ports silently stop forwarding traffic within minutes of boot. The lights stay green, the management UI looks normal, but everything connected to it loses internet and falls back to a junk self-assigned IP. The only "fix" is rebooting the whole router, and then it dies again a few minutes later. Rinse, repeat.

What I tried before figuring it out:

• Factory-reset the router

• Tested every LAN port individually

• Swapped multiple ethernet cables

• Removed the SFP+ transceiver and moved WAN to a different port

• Rebooted everything multiple times

• Reconfigured WAN with static IP, MAC clone, and gateway from scratch

• Changed the LAN subnet entirely

• Built a fresh admin account from zero

None of it stopped the wedge.

The real cause: Ubiquiti has quietly revised the UDM Pro SE hardware multiple times (Rev 3.1, 5, 8, 10, 12, 25 — all confirmed in the wild) without ever announcing it publicly. Early-production units like mine have a manufacturing defect that newer batches don't. On top of that, current firmware (5.x) was designed and QA'd against current hardware — so when newer firmware lands on an older board revision, edge cases trigger that Ubiquiti never catches in their lab because nobody there is running years-old silicon. That's why some UDM Pro SE owners have zero issues on the same firmware I'm running.

This is not something I can fix with config, cables, or firmware. The hardware itself is the problem.

The fix: I'm ordering a new router Monday for Tuesday delivery with overnight shipping. Once it's here, I'll get it racked and configured, and we should be back to the rock-solid uptime you're used to. No more daily reboots, no more random drops, no more rollercoaster.

In the meantime: Expect the same up-and-down behavior through the weekend and into Monday. I'll keep doing reboots as needed to keep services available as much as possible, but it's going to be intermittent until the new router is in place.

Massive thanks to everyone for bearing with me through this. It's been genuinely frustrating chasing a problem that turned out to be silicon-level, but at least now there's a clear finish line. Tuesday is the day.