Hextech Craftiong Questions

I really have no idea how the system works,but I'm pretty sure I'll get it when it comes out.But for the meantime I would appreciate if somebody could help answer this(though the last question can be left,I'm mostly hoping a Riot employee will read that)

1)At the start of each month,all slots to hold chests will be unlocked.Is this correct?

2)If the answer to the the 1st question is correct,if I,of some luck managed to gain 4 chests in a week,if I earn another S-grade will I lose the ability to earn a chest with the champion as all slots are full?

3)Will playing with a friend and they earn an S along with me,will we both get 2 chests? And as a sidenote if I only have one slot that is open will I not be able to earn a chest for one of the either champions?

4)Will I have to manually accept the chest?(I have a problem,sometimes my client closes after game,so will I lose the chest if that happened?).