Besides email acting flakey (randomly asking for login info, not connecting etc - since Insight decided to use a 3rd party email provider, email service went way downhill), I've got the same problem - ALL streaming hiccups a lot more (YouTube, Internet Radio - SomaFM, Netflix, etc) and all of the sudden. I'm a network engineer and have sent my own test traffic - it's being throttled at the node.
To top it off, my bill went up (somehow I've been on an "intro" rate for 10 years - really?!?!).
I'm convinced this "throttling" is being done on purpose since the Time Warner takeover to encourage us into buying cable TV (for those accounts that just have internet & phone).
Switching providers, for sure (now that real competition has come into town).
I'm in Louisville Metro.