My th350 won't stop leaking

I drive the car maybe 50 miles a year. Maybe that's the problem?

Either way I've had the transmission rebuilt twice in the last 10 years both shops had a 1 year warranty. No leaks for 6-8 months, sent back multiple times after that until warranty ran out.

Is this just normal?

Is this from only running the car every 3-4 months?

Leaks primarily seems to be leaking from the actually input shaft. So it would be one thing if it was something where I didn't have to pull the trans to deal with.