Have you tried replacing the batteries? What is your model code?
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I have the same issue. Try using a normal IR remote. It allows me to use most of the features. It also revealed what is actually going on (for me anyway). The TV is losing its Bluetooth (what the original remote needs to work properly) and wifi functionality sporadically. It seems random. When BT/wifi starts working (I checked system settings or YouTube works etc), I can pair my original remote but it’s a hit and miss. After a few minutes it goes back to the red blinking, ‘not available’ message again. Very frustrating 😞
Yes, I’ve replaced with new remote batteries. Model is UN65LS003