We run several HP DL380 Gen8 servers as Windows 2012 R2 Hyper-V hosts. Randomly, they stop responding on the customer NIC (ie the one connected to the virtual switch). Customers are disconnected from VMs.
Luckily we have found that we can get to the server via the management NIC okay and we simply disable/re-enable the customer NIC and all is well again. This happens every few days and there seems to be no trigger.
I have ensured that the adapter drivers are the latest (v220.127.116.11 HP Ethernet 1Gb 4-port 331FLR / Broadcom NetXtreme).
Has anyone else experienced this? Could the cause be in the physical NIC, the driver or perhaps in the Hyper-V virtual switch?