ZigBee RGBW light green channel stopped working

I have an Osram outdoor light where the green channel suddenly stopped working
I’ve purchased a replacement and all works, and have opened up the old one to take a look, but see no obvious signs that might lead to the green channel not working

Before I bin the device I just wanted to check if there were any issues known of that can cause a single colour channel to be unresponsive in software?