Not sure what browser the OP is/was using, but Firefox and some Maxthon browsers have been doing that a lot, lately. I think Flash is holding/hogging memory (not releasing it). I've always used IceDragon (FF) and it started doing that a few weeks ago. After playing a couple of rounds, I'd have to close browser, clean out memory, clear flash, clear cookies/cache and it was good for another couple rounds.
I started using Slimjet (Chrome alternative), and haven't had any issues with screen, loading or meter (knock on wood).
I hate Chrome more than IE, but it's the only way, for now, for me to play this game.