We have Dell R330 server with Broadcom NetXtreme Gigabit Ethernet cards, driver version 17.4.0.0 from Feb 2016, Windows Server 2012 R2 Std. x64 in a domain. The server is connected with a cable to a 3Com LAN switch - the same switch as other network servers, printers, workstations etc.
The server is normally available through tha LAN network but sometimes the connection gets broken for a fragment of second. The outage is long enough to be seen on RDP connection that shortly shows "Reconnecting" screen. Also sometimes a SQL Server connection fails from or to that server. It happens only occasionally, only at some times more often (e. g. sever times per hour). Even SQL Connection form the virtual Win7 PC on that server to SQL database on that server ocassionaly fails. Hyper-V, IIS, File services are installed.
In the event log there is only event 1058 The processing of Group Policy failed.
every cca 2 hours but I do not think this is relevant.
The driver is updated but what can cause this, how to find out? No other network device behaves this way on our network.
I have run True Ping with delay of 500 ms and reallly the connection between the virtual host and the hosting server fails too.