Looks like the last post about this was in 2021 but it's still happening to us in 2022. We use Avaya VOIP phones with PoE, and occasionally they'll just "die" and start boot-looping. If I plug a (working) spare phone into the same port, it starts bootlooping too. If we leave a "dead" phone for long enough (like, days) before plugging it back into the same port or a different one, it starts working again. So the pattern seems something like this: port freaks out phone boot loops port stays freaking out for hours or days, "bricking" any phones that come in contact, so that the same phone can't be used anywhere on the network after some hours or days of being inactive, all affected switch ports and phones recover and work normally again I've tried a ton of different settings on the phones, on switch ports, on the IP phone system... to no effect. I expected it was something related to STP so that was the first thing I turned off, but it didn't care about that. I'll keep trying things over time, but so far the only solution is to put everything in quarantine for a couple days whenever it happens.
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