Is anybody else getting loads of short MB work units that get processed very quickly by the GPU ?

My average time per WU used to be about 14 minutes with my 560Ti processing 3 WU at once, but I am getting loads that complete in about 4 minutes and then go on to validate OK.  But as a result I am crunching over 2000 WU per day between my 2 cards which is putting my connection under a little strain or causing me to run out with Seti's server issues.

Anybody else seeing this or is it just me ?

I had no idea it was an ongoing problem because normally I just let Seti chug away in the background, but having recently applied the installer version 0.39 I have been paying a little more attention to ensure everything was OK. Thanks for putting my mind at rest.