I had trouble with that on the original models, even with a good (or at least official) power supply (many reported the issue was worse with cheaper USB power s

I had trouble with that on the original models, even with a good (or at least official) power supply (many reported the issue was worse with cheaper USB power sources). Never had trouble with the 3 that was a Kodi box and latterly has been used for some electronics experiments, the 4 that is my current Kodi box, or the 400 that has been playing as router+firewall+VPN since early this year (at the time getting a 3 or 4 for the job would have been either expensive or near impossible, and I didn't want to try a potentially less well supported option, but I spotted a nice offer on a 400).