(You tell Mina what you learned.)
The problems you mentioned are all due to the cycling of power. To solve them, we must examine the source of the power.
There is an ancient guardian Sprite named Kasper in the plateau near the Ecliptic Tower to the northwest. It has been observing the local power flux for a long time.
You should ask for its insights. Before you can do that, though, you will have to fight the Ecliptic Warrior and Ecliptic Sentinel blocking your way.