Cabbie21
I just wish I knew what was wrong with it and if it is repairable, but the nearest repair cafe meets only monthly and I cant wait that long. My carpets are dirty!but I just think it must be life expired. I have taken it apart, checked for blockages, removed cottons and stringy bits, cleaned the filters, but I cannot get into the cleaning head( brushes look very worn). It charges well, so I reckon it must be something electronic. It either does not start at all, or more usually, starts then packs up after about a minute. It is out of warranty, being five and a half years old. Battery had only a two year warranty but seems fine still.
Have you contacted the manufacturer?
I don't know how good Shark customer service is, but the on/off switch on my elderly GTech failed recently. Customer service were very helpful. I've had to replace the 'body' of the machine, but all the removeable parts were transferable (roller brush, battery, handles etc) and it cost me far less than any new machine would have done. Maybe Shark has the same sort of service.