hi few months ago i purchased a swap and go bottle from bunnings victor harbor ,initially it worked fine ,now mu bbq is only getting warm ,i tried resetting the valve by turning off removing regulater pipe , refitting after 5 mins and turning on gas very slowly ,bbq still only getting warm .. i swapped bottle with one from my gas fire and bbq is hot ,,do i have a stuck valve in my bottle ? gas bottle has only done one bbq (baby q ) so nor a huge ammount of gas used .