Hello.

The only "clear-cut" issue is at hop 4 here - the packet loss at 9:36am. The other latency and little bit of jitter at the prior hops doesn't seem to be showing up at hop 4 (the T1, right?), so what you're looking for is something at hop 4, or between hop 3 and hop 4. Do you have a network hub there (like a 8/16 port hub of some kind - that doesn't have any smarts)? My bet would be on failure of a power supply or the hub itself in a low-intelligence hardware piece between hop 3 and 4 (maybe as "low intelligence" as a network cable).

- Pete