Why a remote that worked yesterday suddenly needs pairing again
A voice remote holds its link to exactly one device. Power cuts, moving the player to another TV, a system update that rebooted the device mid-link, or swapping batteries slowly enough for the remote to fully reset — all of these can drop the link, and the remote comes back up broadcasting to a device that is no longer listening.
That is why the reliable sequence restarts the device first and the remote second. Holding the pairing button over and over without power-cycling the player is the most common dead end: the remote is doing its half correctly, and the other half of the conversation is not listening.