I have a Guardian Talisman (Fierce) bug I have tried to upgrade and evolve several times in the last 14 hours and every time when I go to exit the character screen I get a server error saying changes were not saved. I've tried on wi-fi and 4G connections at different locations with the same result. I can do other things like evolve and upgrade characters and green talismans fine (although if I do it the same time as the Guardian one the changes are lost - I have to do them separately).

I have other Guardian Talisman (Fierce) I have upgraded and evolved in the past with no problem.