Common eBike problems and solutions

Hey everyone!

I'm thinking about upgrading my eMTB soon, and it got me wondering about common issues folks run into with their eBikes, especially after a few hundred miles. What are some of the recurring problems you've faced – maybe with batteries, motors, or even just general wear and tear on components that differ from a regular bike? More importantly, what solutions or preventative measures have you found effective? I'm curious if there are any "gotchas" to watch out for when considering different brands or models.