Roku Model 3810x Error 023.2 - keeps rebooting or not playing channels

Try another USB power adapter just because you probably have one lying around and it's an easy thing to try.  My current theory about why devices suddenly start showing the low power warning is dirty/corroded contacts in the chain from the power adapter to the Roku device - most likely the micro USB connection.  If you have or can get some electrical contact cleaner try spraying the various connectors.  I'd say try another USB cable, but you need the one with the long range Wi-Fi receiver for the stick to be useful.