Well, since it's a severe transition from one colour to another and not just because of dying batteries (like it is for the mixed colours), I really can't say for sure what the cause could be
But that's normal for mysteries, isn't it?
However, I'm quite sure that removing the tape wouldn't affect the flash and the colours. I think that the issue is more on the LED side than on the board side
Colour changes don't normally occur on the board unless it's Diamond or Emerald
Yeah, that was a great time when they were around...so much knowledge, still more than I have now. And I'd say I've learned quite much in 4 years