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I'm trying to troubleshoot a major issue we are having, we've just built some new PC's (100 in total) - I opted to go for an intel board DH87RL and the onboard NIC is an INTEL I217-V at random times of the day our whole network which is consists of HP procurve's will just crash out, the switches look like they are being looped, spanning tree protocol is enabled so this should not happen and in fact doesn't if we try to loop it manually so we can rule that out, to resolve the problem at first we simply rebooted switches and everything came back online and was fine again. During the next crash occurrences we then started to manually unplug fibres so get to the root of the issue and then once we found the offending switches we narrowed it down to the ports, in the many times we have managed to find an offending end port its always been once of the new Intel PC's. Bios has been updated, NIC drivers have been updated and the problem is still happening, when we reach an offending PC its normally just sat there waiting for someone to login and simply unplugging and re-plugging the cat5 cable fixes the issue (hence the reason in the beginning rebooting the switches fixed the issue) Has anyone ever had any similar issues with NIC's crashing the network? It's new to me in my 15 year career have never seen it happen before and none of my team have ever heard of it happening before and had to see it for themselves to believe it! I have a case open with intel support who seem sceptical about it, send them some logs of my switches yesterday but it doesn't help me in the meantime We built these PC's ourselves over the summer holidays to save on cost, the thought of having to rebuild another 100 to swap out the mainboards just doesn't seem like a viable option at the moment, also forking out another £1k for PCI-E nics also doesn't seem fair when we selected to purchase the Intel DH87RL board specifically to begin with as its supposed to be a flagship workstation motherboard which wouldn't have such issues!