Sounds like you have some bad adgetator dogs
they are plastic and they sit inside the white adgetator . take that off and you will see four of them. usually you need to remove the fabric dispenser first to take the bolt out of the adgetator out.
Sounds as if the transmission agitator pawl is slipping. inside the transmission is a gear connected to the agitator. there is a spring loaded pawl that rotates around the center and engages its pawl or hook into the agitator gear for each rotation. either the pawl hook is worn or the agitator gear is rounded off. the transmission must be opened up to see what is a miss
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