Magnolia with yellow leaves

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My magnolia has some leaves that are yellow. I'm not sure if it's to much sun, not enough water or wrong amounts of fertilizer?

Tree was repotted this year and is less vigorous than last year, which is to be expected, but I'm not sure what else might be wrong.

Tree gets full sun, I'm watering twice daily most days here in the dry summer north west.

Pictures attached.

 

[0soyoung]

It is just what they do.
Exactly why eludes me (still).

 

[PowerTap]

It is just what they do.
Exactly why eludes me (still).

Do you just pick them off as they yellow?

 

[0soyoung]

You could, of course.

I don't, simply because my attention is primarily on my conifers with all their pretty, new foliage. All deciduous leaves are starting to look a little tired this time of year, so I just don't bother. I've got other things to look at, other things to do. That's all.