VMWare-ESXi server dropping packets, shaky connection

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http://serverfault.com – I have a few virtual servers running on a VMWare-ESXi server. One of those is a mailserver running Windows server 2003, Has been running quite well for a while now. About 4 days ago, the mailserver runs beautifully for about 5-8 hours at which point it slows down to an unusable crawl. When I try to VM into the server it most likely tells me that it' can't connect and I can't see what's going on. When I try to ping the server, it usually drops 2-4 packets, ping 2 seconds later a different 2-4 packets with the pingback time ranging from <1 to 200+ wtih a few request timeouts and somethi (HowTos)