Talk:Ensemble Stars! Master Guide/@comment-36184665-20180921071332/@comment-4339465-20180921071520

Hello. Are you referring to your teams for producing lessons/courses or your teams for lives? (1st of 3 buttons vs 3rd of 3 buttons when tapping the units/ユニット button on the menu)

If it's the one for lessons, the auto-select chooses the highest rarity not-fully-levelled cards and puts them in your team to level them up. If you've already fully-leveled some of your strong cards, they would thus be excluded from the auto-select. If you're losing mid-lesson battles because of this, you'll need to choose a stronger card to bring manually.

If it's the one for lives, then it usually means you had a card with raised stats due to a campaign, and that campaign ran out, so the card became weaker again/returned to its actual strength. This can be mistaken as sudden weakness of teams that wasn't there before, but from your description it sounds like it may be the first one.