Received mine on Friday. Set it up and it would start to reboot itself. Felt the Roku 3 - and very hot. Unplugged it for a day, and plugged it back in, within 15 minutes, it started again. Sent support an email, and this is their response:
Thank you for taking the time to email us. We appreciate your concerns as well as your business.
It will overheat, as many computers will if not turned off at the end of the day. Please make sure to keep it turned off when not in use and when you can use it unplugged. Thank you.
Woot Member Services,