Graphing issues?

We've been looking at graphs for a few of our customers last night, all on different access technologies (FTTC, 20CN and 21CN), different endpoints, data centres and geographic locations but they all show the minimum latency increasing for a period last night.

http://www.thinkbroadband.com/ping/share-large/8dec7...

http://www.thinkbroadband.com/ping/share-large/e8367...


Normally if there's an increase in latency you'd see something like this:

http://www.thinkbroadband.com/ping/share-large/82d6b...

We've checked through our network graphing and can't see anything that would be causing this, could it be a graphing issue for those lines?

Maybe I am missing it, because the lines are to the live graphs rather than snapshots, but there is no jump in the minimum latency I can see for Thursday night/Friday morning

Is it something like http://www.thinkbroadband.com/ping/share/cb52641296a... that you are talking about?

I'll find a snapshot graph rather than live ones and post that later.