Gosh this is a mystery, but a couple of things.

First of all there may be an almost invisible crack or break in the support structure, and you may want to replace those parts even if it does not look like a problem. A broker support part is usually the culprit.

As for your leak, that is probably where the two parts of the drum come together or a hole somewhere, but more likely the former.

Wish I could be more specific but problems like your with these models are just very difficult to diagnose even if we were seeing it in person.