Sounds like you have too much suction in the hammer cylinder. The hammer may be getting stuck at the top of the cylinder. Inspect to see if the hammer beat piece will slide out of the hammer cylinder. There may be too much grease behind the hammer causing suction at the up stroke. There may also be scarring inside, so inspect to see if the hammer beat piece slides smoothly. Hope this helps.
It sounds mechanical. The rotating cam that turns to hammer
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