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Heheheh...got to love guessing via the Internet...
The piston isn't going any faster or slower when the rifle is in full auto or semi.
Friction will heat up the cylinder/o-ring...but I'm not sure how appreciable that will be. Heat will also "liquify" the grease a bit relative to its cold state. But all these effects should be minimal.
If the compression system is solid...shoot a couple of hundred rounds through it to blow out any grease that may be in the nozzle/rubber. Let things settle and then do some semi auto tests. Swap the hopup rubber for a clean one after if you want to ensure that it's clean.
Other than that...swap the nozzle.
Dunno
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