Any Network gurus out there?

[elfs]

Calling all network gurus! My ISP and I have been going 'round, trying to figure out what the Hell is going on with my network. My whole day has looked like this:

64 bytes from 66.93.87.2: icmp_seq=98 ttl=62 time=37.0 ms
64 bytes from 66.93.87.2: icmp_seq=99 ttl=62 time=40.4 ms
64 bytes from 66.93.87.2: icmp_seq=92 ttl=62 time=17835 ms
64 bytes from 66.93.87.2: icmp_seq=93 ttl=62 time=12791 ms
64 bytes from 66.93.87.2: icmp_seq=94 ttl=62 time=11101 ms
64 bytes from 66.93.87.2: icmp_seq=103 ttl=62 time=38.9 ms
64 bytes from 66.93.87.2: icmp_seq=104 ttl=62 time=42.0 ms
64 bytes from 66.93.87.2: icmp_seq=105 ttl=62 time=38.2 ms
64 bytes from 66.93.87.2: icmp_seq=106 ttl=62 time=36.2 ms
64 bytes from 66.93.87.2: icmp_seq=107 ttl=62 time=35.9 ms
64 bytes from 66.93.87.2: icmp_seq=85 ttl=62 time=30965 ms
64 bytes from 66.93.87.2: icmp_seq=86 ttl=62 time=29955 ms
64 bytes from 66.93.87.2: icmp_seq=87 ttl=62 time=28955 ms
64 bytes from 66.93.87.2: icmp_seq=88 ttl=62 time=27955 ms
108 packets transmitted, 91 received, 15% packet loss, time 358031ms
rtt min/avg/max/mdev = 35.053/19693.559/100801.805/24906.176 ms, pipe 23

The guys at speakeasy, who are usually competent, say they've never seen anything like this; short bursts, followed by long periods where there are packets 30 seconds old coming back. I've even seen a packet 5 minutes old! What heck is going on?