I have exactly the same problem. From time to time, red and green is completely missing. Only blue works. All other colors are close to white, yellow, light orange. Seems there is a problem with the hardware. I got that lamp from Gearbest some days ago. Since then it's the second time, that this problem occurs and I have no idea how I can fix it. Reset and FW update does not help.
Do I have to contact gearbest to replace it? Or are their other ideas to fix it?