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This issue does still crop up from time to time due to hardware / software compatibility issues with some TV Boxes. The newer software is less likely to suffer frequent issues of non-responsiveness but if the problem is very frequent then a box replacement may offer a solution.
A faster, gentler on the hardware and easier way for you to restore remote control operation when the TV Box is not responding (except to power off or volume controls):
When the front panel lights aren't changing (which would indcate a recording in progress for the TV+ Boxes), press and hold the front panel power / standby button for around 8 seconds or so until the front panel lights change. Release and wait for the TV Box to restart. The remote should then be fully functional.
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