For problem 6, i found that it occurs whenever a heart event (the cutscene that plays when arousal is >= 100) triggers while she is still in your party. The game probably thinks that she is still in your party after the heart event and therefore stops her from following you again. I made a new save file where i dismissed her before the heart event plays and just hugged her, and surely enough, i got to order her to follow me after the 3rd heart event.
Also funny thing, if you manage to trigger problem 6, problem 1 gets fixed, lol. Honestly as annoying as these bugs were, i still had fun, and i think this game still has a lot of potential. But for now all we can do is wait and let the developer cook