keith20mm posted an answer for this Hoover U5444-900 5100 Wind Tunnel 15 Inch Wide Hepa Filter Bagged Black VacuumVacuum:
"Motor front bearing retainer probably melted from grit. Replace motor. The motor's rotor..."
keith20mm posted an answer for this Hoover U5750-900 WindTunnel Bagless Upright Vacuum:
"I have a similar bagless model U5757-900 that is shutting off. I disassembled the unit,..."