Is this network problem?

[coobyte]

In most time, the speed I access my site hosted in HG is good. However, sometimes the speed is much slower.

I find that when the speed is fast, I ping my site , the result time is a few more than 200ms, it is mainly spent on the hop cross pacific occean. other hops take very little time.

However, when the speed is slow, I find the ping time will be about 400ms. I notice the extra 200ms is spent on the hop of ip:12.87.41.150, by the names, I guess this node is a key interface bewteen the att.net and network of ThePlanet.

the list of traced route as below. please read the line 16 and line 17.

1 11 ms 13 ms 10 ms 221.221.232.1
2 11 ms 9 ms 9 ms 61.148.36.41
3 10 ms 10 ms 9 ms 61.148.5.5
4 9 ms 10 ms 9 ms bt-228-045.bta.net.cn [202.106.228.45]
5 11 ms 9 ms 9 ms 202.106.193.130
6 16 ms 23 ms 16 ms 202.96.12.13
7 46 ms 43 ms 46 ms 219.158.4.66
8 46 ms 42 ms 45 ms 219.158.5.126
9 222 ms 224 ms 225 ms 219.158.25.26
10 219 ms 219 ms 215 ms 12.126.40.69
11 247 ms 245 ms 249 ms tbr1.sffca.ip.att.net [12.122.84.45]
12 251 ms 249 ms 249 ms cr1.sffca.ip.att.net [12.122.19.17]
13 246 ms 245 ms 244 ms cr1.la2ca.ip.att.net [12.122.3.122]
14 250 ms 249 ms 249 ms tbr1.la2ca.ip.att.net [12.122.19.154]
15 244 ms 246 ms 244 ms tbr1.dlstx.ip.att.net [12.122.10.49]
16 247 ms 249 ms 249 ms 12.122.100.49
17 * 472 ms 469 ms 12.87.41.150
18 473 ms 471 ms 474 ms te7-2.dsr02.dllstx3.theplanet.com [70.87.253.26]
19 482 ms 486 ms 485 ms 72.fd.5746.static.theplanet.com [70.87.253.114]
20 463 ms 461 ms 464 ms po1.car06.dllstx6.theplanet.com [12.96.160.8]
21 472 ms 469 ms 472 ms c4.e3.354a.static.theplanet.com [74.53.227.196]
Trace complete.

I have observed this condition for a few weeks, it often happens.

Is here someone knows the problem?