help summarising server network traffic

Hi, So I am trying to troubleshoot an issue with a Windows 2008 domain controller where if appears to be working perfects and responding to ICMP with <1ms responses but then all of a sudden we will observe latency in the pings sometimes up to 22000ms and even time out all together. The pings are to/from from a server in the same subnet which is responding fine.

So I have collected a trace during a 1 minute window where pings were fluctuating up to 2000ms on this occasion. I can see the IMCP requests and delayed responses but I am unsure how to interpret the other data to see what may be causing the .

Wireshark Expert Info gives me the following summary but I don't know if this indicates prolems or normal behaviour

Just to add that the duplicate IP entry can be ignored as it is a backup appliance with a pair of nics and is a known bug with the system. The IP does not clash with any other servers...