Power Connect 6224 Stack ID behavoir

Hi.

I got 10x Power Connect 6224 stacked. Last night I added an 11th member.

Question 1: As I understand we can hot add or remove members ?

After I added the 11th member the stack ID of all switches changed. It mess up all my configuration

Question 2: When we add or remove a member will this change the stack ID of the other switches?

Question 3: If member is shut down will there be a change of stack ID with other switches?

                       ---> When do stack ID changes and when do stack master changes ?

Before adding the 11th and 12th member, the Stack Master was switch with Stack ID 1.

Question 4:Does the stack master change when we add a new member ? After adding the 11th member switch with Stack ID 9 became the master.

Question 5: I notice time outs now every time I save the configuration. At least 3 timeouts are seen. Is this normal ?

Thanks,

Paul