Sorry to hear you experienced the same thing on a much larger scale. It seems too coincidental to lose 4 of them at once, even in your environment which sounds many times larger than mine. My faulty site has approximately 15 ADTRAN devices of various models and I only lost the one that day (no other issues, knock on particle-board-desk-material). I removed my faulty one from production but continue to tinker as time allows as I am not convinced of the lightning strike. It still functions perfectly as a non-POE switch. Never seen anything like it.
I branched this topic to a different discussion. The problem you are describing, if it is not related to environmental issues, may be related to an issue resolved in AOS firmware version R10.5.3. Here is the release note:
- When under heavy load, an AOS switch could stop providing PoE on some ports. A reboot would resolve this issue.
Please, let me know if you have any questions about this, or if there is anything I can do. I'll be happy to help in any way I can.