Could it be your paint? Bad, old, or warped shaped paint can pose problems and not the marker itself.
You'll have to provide more details as to what the problem is for people to assist you. Start off by your marker set up? What are your pressures on your hpr and lpr? Is the battery new? Leaks? Paint a picture of the problem in their mind for them to assist you.
Someone is bound to guide you in the right direction here.