Yes,York has had problems with leaking shaft seals. However, their bellows style seal works very well. Providing the thrust is in spec. and the chiller does not surge excessively. It also helps if the chiller has the standby seal lube.
would also agree with you that YORK has one of the biggest problems with low run time because they have open drive compressors that have shaft seals to leak. They also have motors that are exposed to the elements along with varying temperatures. Carrier and Trane chillers have enclosed motors, which in my opinion are much better.