Traffic shaping going on?

Doesn't seem directly correlated with outages, and everything seems to be working ok, but I'm seeing about a 20-30% shift in flows from AS7792 to AS3356. Seems unlikely that many ISPs have suddenly turned up a level3 link on the same day/hour, and performance metrics all seem normal. I confess I've had to turn my attention away from network issues to systems/DB/security ones lately, so I may have missed something. Anyone else seeing fairly significant next hop shifts over the previous 24 hours? All of yesterdays major outages I was sort of suspecting seem to have been resolved without correlating shifts back. -R>