EZ Flash JR has stopped working

Hi there,
I have a pretty new EZ flash junior, and it was working this morning, absolutely nothing changed, I turned off my gameboy and went for a drive, I come home to play it and it's now stuck on "OSINIT..." and won't boot, I've tried multiple SD cards and multiple gameboys and nothing works, what could cause this, and more importantly, how can I fix it?

Thanks!