(1) If your status remained the same from 2014 to 2015 or changed on Feb, 1. 2015 (the status changeover date). (What is your status?)

2013 S>2014 S> 2015 no status (on 2/1/15)

(2) What were the reasons your status changed, or remained the same on Feb. 1 ?
Deferred transferring elite-qualifying miles until new year, to maximize duration of elite status (Gold from 2/10/15 through 1/31/17).

(3) Did you have any particular difficulties in maintaining or increasing your 2014 status for 2015?

No, this was a choice.