G900F keeps rebooting at startup screen

I have a Samsung S5 G900F, bought from vodafone on payg. Long story short, it is under warranty, but when I took it to Samsung they said the knox had been tripped. I'm going to pursue this with them, as this phone is used by the mrs and (as far as we know) has never had custom software on it.

Anyway, it started randomly rebooting a while ago, and I tried updating the software with kies, which seemed to fix it for a while. It has now gotten progressively worse, to the point that it is not even getting past either the boot logo, or as part way through the boot process (samsung logo etc). Occasionally, after a cold start, it makes it to the OS, but then reboots shortly after.

I've now tried using odin to install the stock firmware (vodafone branded - G900FXXU1BOJ1_G900FVFG1BOJ1_G900FXXU1BOJ1_HOME.tar .md5). I've also installed philz custom recovery (tried twrp too), and then to install a custom rom. Ive tried cyanogen and phoenix. They install fine, but the phone continues to reboot when starting up. I've not yet managed to get to the OS for either custom rom.

The phoenix rom also came with a bootloader/modem package, which I have installed.

I've run out of ideas. It's probably a hardware fault. But is there anything else I can try before binning it?

Thanks.

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