Pockex Burnt taste with new primed coils

Hi recently our purchased pockex (roughly 2 months ago) loved it! for the last two weeks I keep getting a burnt taste. Vape shop said probably dodgy coil switched it. Primed new coil and after about 10 pulls get same burnt taste. If I unscrew the top and screw back on it goes until another 10 pulls (roughly) I have tried about 4new coils and used different flavours always the same can't go more than 10 - 15 pulls literally. Also used 60/40 mix as well as 70/30 always same results. Have to keep unscrewing and rescrewing any ideas!? Help
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