Ok serious answer time. Did you buy the Philips new? If so, send it back.
If it's used, then pull it apart and clean it out. These things always get clogged up and will revert back to their original suckyness with a bloody good clean (which I do on both our Dysons every few months). You can even fling all the plastic bits in the dishwasher.
I swear by Dyson, we've got a big plug in jobbie which I use once a week and it's fantastic, an we have a little battery one which is also pretty damn good.
I bought a VAX once, during vacuuming on day I picked it up by the handle and halfway up to waist height, the handle let go with the thing crashing to the ground and the plastic cracking all over the place. That was the last Vax product I've ever bought.