[Ignition]

Actually I'd say his original traces suggest more local problems to uBR:

2 33 ms 89 ms 32 ms 10.153.175.254
2 21 ms 39 ms 79 ms 10.153.175.254
2 22 ms 36 ms 72 ms 10.153.175.254
2 41 ms * 27 ms 10.153.175.254
2 16 ms 41 ms 66 ms 10.153.175.254
2 76 ms 74 ms 111 ms 10.153.175.254

All over the place.

In the wee hours the issue disappears:

2 8 ms 7 ms 11 ms 10.153.175.254
2 8 ms 7 ms 9 ms 10.153.175.254
2 7 ms 11 ms 8 ms 10.153.175.254
2 19 ms 7 ms 8 ms 10.153.175.254

Note that with those traces even though the transport and core routers, cam and core, still ping higher intermittently this is expected behaviour from a router running BGP and it doesn't affect the ping times to the end destination.

As far as this fault goes I'd either say there were capacity issues there, either it's a temporary loss of capacity or your upstream / downstream are busy. I'd guess upstream looking at the packet loss, etc.