Is this a duff?

I bought my multipla about 6 weeks ago and seem to be having no end of problems with it.

The brakes screech like mad but the garage has checked them and they have plenty of 'meat' left on them.

The screen washers don't work.

The oil light flashes constantly. Had the oil changed but it's still doing this.

The worst problem I'm having with it though is that it is constantly cutting out. I can see no pattern with this though it will cut out when I stop at a junction but also will cut out as I am driving along in say 3rd gear, which is pretty scary as the steering wheel lock comes on and the brakes stop working - not good on roundabouts!

Do I have a dud or can anyone throw any light on these problems. It has been in the garage a few times and they have checked things like the spark plugs but to no avail.

Thanks very much.