What Osage Outlaw said is exactly right . . .
Don't matter if you own a Rolls Royce; paved in gold bandsaw, if it isn't tuned properly, it's not going to cut constitantly, hence the washerboard effect.
Although there is a slight difference in design between models, they all basically work the same.
Consult your manual for the tuning procedure according to your model: tension, tracking, setting the bearing guides, 'WORKING SLOW WITH PURPOSE,'
blade guide height above working piece.
If you follow these guidlines, I think you will have much better results. Bandsaws do require a learning curve in their operation.
A linisher (upside down belt sander) is a 'must have' if you own a bandsaw.
TIP: Un-tension your blade prior to not using, it will last longer.
Hope this helps