Building confidence with reading

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my ds is an able but reluctant reader, he is in y1 and reading band 9.
He appears to have lost confidence recently and his reading has suffered in the form of him panicking and guessing unfamiliar words rather than sounding out or sounding out but rushing and missing half the sounds out, he does come across as having some bad habbits and also as not putting in much effort, he also says he does not think he is a good reader
He has always read well previously, how can i get his confidence back??

The beast quest books. They adore them. I would read a page each out loud. That always spurs my ds on.

It makes me wonder what is going on at school.

Does anyone listen to him read regularly?
Does he know all the letter/sound correspondences?
Does/did he get decodable books to practice with? (I don't know anything about book bands)
Does he find unfamiliar words hard to sound out? Is he expected to sound out and blend unfamiliar words at at school?
Have you spoken to his teacher about this?

I'm just wondering if he's got the impression somewhere that he ought to be able to look at a word and just 'know' it without sounding it out and that he worries that sounding out is the wrong thing to do.