I’ve had all these happen personally except ( * ) starred ones are theoretical or from reports of other folks
wheel bearings squeak/squeal
wheel bearings stick
wheel bearings explode
wheel pulley wobbles
belt skips
belt breaks
motor mount moves
motor pulley slips
motor pulley falls off
truck hanger bends
truck hanger breaks
truck baseplate moves on deck
wheels chunk
battery series connection breaks
ESC dies
remote falls from hand onto roadway
nylock nut backs off axle ( * )
motor goes full-throttle randomly (ended up being smashed PWM wire to radio receiver)
remote cuts-out in certain spots (radio interference)
remote charge port breaks
remote power switch breaks
remote battery dies
motor sensors fail
enclosure breaks from blunt force
bushing binds up on kingpin, then suddenly lets go
snow packs wheel pulley
water fries ESC
phase wires touch each other
forgot to charge board
left board turned on for months
board auto-shutdown at traffic signal
antispark fails closed
forgot to grab remote
grabbed remote for another board
forgot to charge remote
rock enters belt system
deck breaks
flat tire
water inside enclosure
USB port breaks off ESC
motor can rubs
motor loose on mount
belt came untensioned
idler full of gunk
idler became loose
battery no longer lasts very long
board turns on but won’t respond to remote
motor bearings squeak/squeal
motor bearings stick
motor bearings won’t turn backwards anymore, only forwards
motor extremely noisy
broken magnet
slipping motor axle on rotor/can/bell
motor axle pulling out of rotor/can/bell
motor pulley stuck, cannot remove from motor
motor circlip scraping mount plate
pulley bearing fails
ESC power connector pulls apart
radio receiver falls off board
radio receiver antenna falls off
radio receiver becomes disconnected
accidentally shorted charge port
charger broken
charger port broken
loopkey mount pushes into board
remote failsafe not set
clicking magnets
bent motor mount
motor gear slips on grubscrews
broken stator ( * )
I’m sure I’ve forgotten something