What might cause a switch to STOP.?

[tomtech]

Let me explain
We have a new (2 month since we purchased) WS3 switch. Its been in production at a tower for about 5 weeks. Its a DC switch serving only 24v to POE AP's mostly Ubiquiti and Cambium. DC is supplied from a ICT modular serving 56v. It has been working perfectly, then one saturday at 3am, it stopped. When I got on site the power light was off, fans off, no LED's anywhere. Voltage perfect at the terminals. Power cycle got a green power light and fans, but it shut down after about 90 seconds. No ammoiunt of power cycle, waiting for 30 min, then power up, changing DC circuits, nothing got the switch running. We swapped it for a Mikrotik because we need to service our customers. Brought it back to the shop and before we RMA'd it I decided to pwoer it up, and it came up. I reset it to factory and its working fine. I left it on for a day and it still works. But I am NOT putting it in production until I understand why this would happen.

So, thats the question, what would cause a switch like this to bork so badly, then come back to life???

I appreciate your attention to this matter.......

Tom

[sirhc]

No idea.

Please explain how your powering it again?

Is this a site with AC or off grid?

If off grid with battery bank it must be connected directly to the the batter bank not a controller.

Read these posts and links and links on those posts.
viewtopic.php?f=6&t=4450&p=27007&hilit=+heaven+forbid#p27007
viewtopic.php?f=6&t=5986&p=31662&hilit=directly+to+battery+bank#p31662

hooking to charging controllers can cause issues and intermittent power flickers can corrupt flash which makes sense that a power on factory default corrected.

[tomtech]

Site Is NOT off grid. ICT manufacturers broadband focused power products for grid tied and off grid applications. Our DC controller manages charging of a bank of 4 190AH lead acid batteries and connects to a DC power distribution module that feeds various devices on the tower. We do all our 48/56v from this device using a 9dot POE injector, and all our 24v mid span through the Netonix.
This is the link to our power controller: https://ict-power.com/product/hybrid-power-series/
This is the link to the DC power distribution module: https://ict-power.com/product/ict200db-12irc/
All DC buss outputs are protected by circuit breakers. We follow all grounding rules. The Power modules have no alerts or errors and our SNMP monitoring shows no unusual events from any gear except loss of signal.
Hope this helps provide some context.