Mine was getting noisey during hotter days and during certain games (LBP in particular after around 5/10 mins).
Anyway, the other day I got my Dyson (cylinder model - so it's basically all plastic) and sucked as near to the vents as I could get - I also put my finger over any part of the vacum nozel that wasn't over vents to maximize suck.
It now seems fine (touches wood), it's def. a heat (time of year thing) but as the vents were clogged that will obviously contribute (IMHO).
Anyway, the other day I got my Dyson (cylinder model - so it's basically all plastic) and sucked as near to the vents as I could get - I also put my finger over any part of the vacum nozel that wasn't over vents to maximize suck.
It now seems fine (touches wood), it's def. a heat (time of year thing) but as the vents were clogged that will obviously contribute (IMHO).