it just sounds like your hop-up rubber is swelled up a bit causing overhop. Or, the ball bearing nub that presses down on the rubber is jammed down. Just take apart the hop unit and inspect each portion. Be sure not to loose that ball bearing when disassembling.
Remember there's cool down when firing in full auto. gas pressure drops in auto so there's always going to be a difference in hop between the two modes due to the changes in fps.
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