It could be the solenoid on the reducer needs cleaning, there are filters as well that need changing. If the sensor detects a low gas pressure it thinks you've run out of gas and switches back onto petrol. Unless you know what your doing it could be easier to just book it in for a lpg service and tell them your problems.
Good luck Dave
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2002 S8 silver with black half leather
2000 d2 S8 in Racing green pearl, RS4 manual gearbox,
2003 A4 avant TDi
1997 Volvo V40 2.0T
1992 Mazda eunos v spec
1976 Reliant Kitten
1965 Porsche 911
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