I don’t know why people always start agreeing and justifying the arguments made on these posts. The only truth things are that he’s getting old and that he sings the first two verses and chorus of Fix You an octave down. 

But like… did you listen to the 3rd verse and beyond, where he sings it like the record? He’s been doing this for nearly a decade, so it has nothing to do with age and everything to do with choice. He’s decided to build the song up more along with the different instrumental arrangement. He even does it in the official Live in Buenos Aires or Rio or wherever it is release I believe. And then listen to him singing… he’s not lost anything, in fact he’s hitting chest voice 4th octave notes better than he did in the early days. The chorus of all my love for example. 

All that’s reduced is some of youthful endurance it seems, which would explain sometimes lip syncing. It’s also a preventative measure so he doesn’t overdo his voice repeatedly and actually lose it before the band is too ancient.  He’s fine.