Common eBike problems and solutions

Hey everyone!

I'm looking to buy my first eBike soon – probably a hardtail electric mountain bike for some trail riding and commuting. As I'm doing my research, I'm curious about what common problems people encounter with their eBikes, especially after a few months or years of use. Are there any recurring issues like battery degradation, motor quirks, or specific component failures that I should be aware of or look out for when buying? What are your go-to solutions or preventative tips?