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My 116520 recently did this. At night the power reserve would only last until about 3 AM when chronograph running too. It was sent back to Rolex and received a full service and it all works perfectly now.
When I studied mine with the chrono running the minute hand on the chrono would run the same as the centre seconds hand, racking up hours on the registers when only actually running for minutes. They didn't give me the exact details about what was occuring but a service rectified the problem.
Good luck.
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Rolex Explorer 214270, Omega Speedmaster '1957 Relaunch' 3594.50.00, Panerai Luminor 1950 PAM00127-E, Panerai Radiomir 1936 PAM00249-I, Panerai Mare Nostrum PAM00716-T, Panerai PAM00785-Q Set, Panerai Luminor Black Seal PAM00594-Q, Panerai Luminor Daylight PAM00604-Q, Tudor Black Bay 54 79000N, Heuer Carrera Re-Edition CS3113, Hamilton Military W10 & TAG Heuer F1
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