A loud or unusual motor noise usually means one or more motor components may be worn, damaged, or nearing the end of their lifespan. Replacing the affected motor rotor typically resolves the issue. Here’s what to do:
If your Betta is still under warranty: Please submit a warranty claim here: https://bettabot.com/pages/warranty-claim
If your Betta is out of warranty: You can purchase replacement motor rotors directly here: https://bettabot.com/products/betta-robotic-pool-skimmer-motors