Cancelled Flights, Cairns Hobart

Having just found this website I realise the only option is to cease flying on Jetstar. Flying to Hobart, one leg was cancelled involving 7 hour wait at Sydney, (trains at Sydney also cancelled but I guess that not Jetstars fault). Coming home to Cairns, one leg cancelled involving an overnight in Melbourne. Our seats were double booked on that flight but luckily there were two spare ones. Previous trip was to Queenstown and one leg of that was cancelled. Impossible to trust now, but that seems to be the norm