Common eBike problems and solutions

Hey everyone!

Been tinkering with my custom-built hardtail eMTB lately – it's a Bafang BBSHD mid-drive on a Kona frame, mostly used for trail riding and commuting about 20 miles round trip. I'm curious, what are some of the most common issues you've encountered with your custom eBike builds, especially related to the electrical side or component compatibility? And more importantly, what clever solutions did you come up with? I'm always looking for tips to preempt problems or fix them efficiently.