The red flashing light may indicate the following:
The TV-Box is not within range of the remote
control. Move closer to the TV-Box.
The TV-Box does not have power. Check whether the TV-Box is plugged into a socket.
The TV-Box needs to be rebooted for technical reasons. Reboot the TV-Box.
Your remote control is no longer paired with the TV box. Hold down the WPS
button on the TV-Box for 3 seconds and follow the prompts on the TV.