I've noticed that when playing pugs on the tf2.pug.na dallas server when the game begins after about 5-10 minutes my ping goes up to 150-200 to the server and then maybe 10 minutes later, it goes back down to my usual ping.

150 Ping especially for scout is still playable for me however, I'm just curious to why this is happening. I've tested my connection during the two games and it seems to be fine through multiple tests I've done and it seems to only occur when I'm playing in the dallas server.

Notes: Only Happens on DA1 not any of the chi servers.
Essentially, I was wondering if anyone was having the same issue and is this a bad routing issue, or anything along those lines?

Thanks!