Sounds like the motor is going bad. If you have an authorized service center nearby, they can repair it. A new motor runs about $300-$400 plus labor to install. If you call Dolphin they can tell where the nearest service center is but shipping costs can add another $50 or so to the costs.
I think you may be right. The weird thing is last night I got it to work for the first time in about 3 weeks. It ran perfectly for two cycles. Then, I went home for lunch today and tried running it again and it was back to not working.