1- It's one of the wonferful DMM feature: stamina cut. -30% stamina for certain maps. This time there is a lot due to the reward of the previous event.

2- They started to give the event girl with 99% affection by clearing the 1st mission. But some players got one with 0% affection and, as compensation, everyone got another one, with 99% or 0% depending who they got the first time. Now, they keep giving two of them. And I just sell the 0% one for bond crystals.

3- There is not true autorun on DMM. There is still an option to have a Nazuna clicking on the button but you need to click once after each battle. The option is in the option tab but I'm not sure which one is it. I think other people can help you more with this.

I saw Kugaisou in your helper team. Congrats