Common eBike problems and solutions

Hey everyone!

Just got back from a killer ride on my full-suspension eMTB – tackled some gnarly singletrack and a few steep climbs, and the motor was a lifesaver. It got me thinking, what are some of the most common issues you all run into with your mountain eBikes, especially on tougher trails? I'm curious about everything from battery quirks to motor oddities or even drivetrain wear. What's been your biggest headache, and more importantly, what solutions or preventative maintenance tips have you found really effective? Let's share some wisdom!