Yes, they did become a little longer, from almost 4/hr empty to 2/h when almost totally full. Probably because it regulates to +/-1 degree Fahrenheit.
Do your modern freezers also gurgle a little when they run and you listen closely? Sounds like water trickling in a table fountain. Strange. But modern products make a lot of strange noises, like the new washer we have (front loader, like you have them in Europe) that makes this turbine sound when spinning.