Omega Speedmaster pro moon watch moisture

I bought the watch new in 2011. Serviced in 2018 due to broken mainspring. Stopped wearing about 3 years ago. It was doing something weird at that time where it would stop if the big second hand was going sometimes with about 95% reserve left. Pulled it out of storage. Still doing it occasionally but otherwise working fine. On a flight out to Las Vegas, I noticed it had moisture under the crystal. I popped the crown out for a few days, but no improvement. Put in bowel of rice with a moisture absoring packet, no improvement.

I bought a case back opener, took the case back off. Everything looks fine. Put in bowl of rice for a week with case back off, then put it in the oven at 170 degrees for about an hour. Re-installed caseback and it's running fine with no moisture.

Does this watch need a formal service again at this point. I'm kinda bummed since I feel like I barely got any use out of it after a $750 service.

It was sent directly to Omega.

I don't know how it got moisture in it. I regularly wore it in pools, snorkeling, etc and never had a problem. But that was BEFORE the service. No water exposure I'm aware of since. (I have a rolex sub now I regularly take for scuba diving and anything in the water, was down about 150 ft last week in Bonaire and it did just fine!). Maybe I left the crown out for an extended period of time, would that do it? It must have had something to do with the airplane to Vegas then the desert climate because that's when it started.