Aye, regulators should be 'overhauled' by a a tech once every ten years or so even if you don't use them very often.
There are springs and seals and teeny tiny passages that determine how they function and they can get clogged or gummy over time especially with the extremely low pressures we like to work with.
It's also a really good idea to let your fuel and oxygen tanks sit still for some half a day before opening the valves.
That way any gunk in the tanks settles to the bottom.
Oh and using propane in hoses made for welding with acetylene can cause the hoses to disintegrate and get gummy and spit crap and clog your torch.
The same is true of using a regulator made for acetylene with propane gas.
The seals and diaphragms inside regulators can have the same reaction.
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