Portal become neutral without any activity

RKoala

I've had a guardian for a long time, and I keep it full for many. Today I went to recharge it and it was white. I noticed that not only it, but some other portals as well

Perringaiden

• Did it move precise location?
• Are you sure you recharged it within decay times?
• What's the portal?

mortuus

most likely someone took it down or flipped and then but why leave it neutral is weird