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I can't say for certain without more information on the local geology. There are a couple of possible ways they could be related.

There is a considerable limestone and dolomite section there according to this report, and it is possible that caves or fractures were opened up. If below water, that could account for some drop in lake level.

The farther below the surface of the lake, the greater the hydrostatic pressure exerted, and even a flooded fracture or cave system, the greater pressure might cause lake water to force its way into the system. That would push any water already there out somewhere else (increased spring or stream flow) or fill any air space in the system by forcing the air out.

Ten feet is a lot of water, and if that keeps up, the loss should be accounted for by investigating what happened.

Otherwise, the "Aliens are stealing our water" crowd will gain some followers...