Kindle Fire is outputting my shader to the log

Hello all.
I’m testing on a few Android devices, and most of them seem to be working.

However the Kindle Fire is stalling on some screens for around 30 seconds, and outputting the contents of a few shaders to the ADB log with lines in this format
D/Unity (xxxxx): […shader code here…]

The shader(s) in question are written in house, but are nothing out-of-the-ordinary. They sample a few maps and perform some simple maths - mostly things like dot() and pow(). Nothing I’d expect to have a problem with.

So far, I’ve not gotten to the bottom of it so any advice on why this happens (and why on Android/Kindle Fire only) would be appreciated.

Check the log more carefully, could it be the shader fails compilation?