Server Network Dropping Out

ok, I was recently very naughty and due to un-favourable circumstances I installed exchange 2010 to a server that was already running SQL. Not ideal, but the 3 month plan will correct this situation so yeah.

The problem however is that since this time, I'm getting periods of network dis-connectivity, its almost like clockwork, at 2 mins past each hour I get a network dropout, pings going out from the server to the local network return first a high ping time then request timed out (See below)


Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Reply from 192.168.1.54: bytes=32 time=1394ms TTL=128
Reply from 192.168.1.54: bytes=32 time=168ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Reply from 192.168.1.54: bytes=32 time=2041ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128
Reply from 192.168.1.54: bytes=32 time<1ms TTL=128


The network card itself does not report a drop, the server is about 2 years old, it has 2 x on-board networking in a teamed configuration, I have tried disabling each in turn.

I have checked all the scheduled tasks I can see and cant find anything set per hour.

We don't believe we had this issue before exchange, but don't take this and conclusive.

Server: Dell PowerEdge R410
Network: Broadcom BCM5716C NetXtreme II GigE
Network Teaming: Broadcom Advanced Control Suite 4 (Version 15.0.30.0)
Windows: 2008 R2
Exchange: 2010 Standard


The problem most noticeably shows with our SQL enabled application.

Any help would be great

Thanks