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I've heard of some folks having this issue.
It can be solved with the bleed block. The reverse side of the bleed block can be inserted to safely extend the pistons out and work them in/out to help lubrication. If you insert it (the end with the flanges poking out and non-textured on one side), then pump the lever, the piston will extend and can be pressed in with a tire lever or plastic lever. You can also drop some DOT 4 (preferable for lubrication) or DOT 5.1 onto the piston, then push it back in to help prevent stiction.
Mine haven't had this issue on mine, though.
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