I have seen in other devices where your remote goes weird and if you remove and replace batteries that kind or resets the remote
The 10 second rule is a good one to let everything power down before you power it back up
I have seen two boxes spiked this way by having power to the power supply before plugged into the box. A good rule of thumb is to plug into the box before the wall plug. Hope you can solve your problem without sending it back for replacement.