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It sounds like you have either a sequencer or a relay that is bringing blower back on.What is serial number on unit?
Just looked in manual and it appears you have what is called a variable speed ecm motor. Let me look a little deeper into issue.
The motor Is high voltage powered but low voltage controlled through a BDC control board.Issue is with either the board or the bell control on end of motor.But unless you have a special ecm tester you will need to have hvac guy determine issue and correct.
If less than 10 years old, should be covered under warranty.
Age can be determined by serial number