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Azalea wilting and going brown - help!

there's now a very thin layer of compost over the root

Azalea wilting and going brown - help!

we've pulled out the roots a bit (gently), repotted and taken the dead stuff off, that might finish it off but we'll try, thank you so much everyone 

Azalea wilting and going brown - help!

We've tipped it out.  There's no sign of any grubs in there, but we did find these orange spheres?  Not sure if they're anything?

 Also we found that for some reason the roots stayed tightly in the shape of the pot they were originally in before we re-potted it, for some reason they'd not spread out (we repotted at the end of flowering 2 months ago)

Azalea wilting and going brown - help!

Just doing it...

Azalea wilting and going brown - help!

Definitely not weedkiller, it can't get into our garden.

Azalea wilting and going brown - help!

Azalea wilting and going brown - help!

Azalea wilting and going brown - help!

It's on the patio in my garden which is south facing, currently under a gazebo. 

My severely autistic son took the middle out, I'm wondering if that's what's killing it?

Azalea wilting and going brown - help!

I'm new to gardening as I only got a house with a garden back in April.

I have an azalea of the Blue Danube Evergreen variety, it's potted as we live in an alkaline soil area.  It's potted in Ericaceous compost, in a pot with a lot of drainage media in the bottom, we only ever water it with rain water (from our butt if it's dry) and during flowering fed it with specific azalea feed (miracle gro).

We don't let it dry out but we don't soak it either.

Just these past few days it has started to go brown and wilt.  I have no idea what is wrong despite extensive googling.

Any assistance gratefully appreciated!

Azalea wilting and going brown - help!