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My internet guess is that your piston o-ring seal needs a bit of work. The burst of full auto is probably getting it warmed up and stretched out to create a nice seal...which will then last for the next couple of semi shots. From a "cold" state...the o-ring will shrink back and not provide an optimum air seal.
If that's the case, either swap the o-ring or reshape it (heat form it). If it's lost it's "rubbery-ness" ditch it and get a new one (good time for other general maintenance as well).
Just a guess obviously, but that's what came to mind from your description.
Best of luck,
Tys
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