1: anytime. Spikes every 15 min or so. Began roughly 2weeks ago maybe a little less.
I'll edit in some specific times from tonight.

2: suentouspo (many others)

3: ipad2 and iphone4g on the current updates (7.1.3 on phone)

4: happens in towns so random fluctuating numbers, and in any and all maps I play with any number of ppl.
Sometimes I can see the ping spike, sometimes it's frozen on green and I loose connection and/or dc anyway.
Started for me about a week and a half to two weeks ago.
Emote spammers never seemed to cause this problem specifically in my experience.

Ps- I logged into al to see what that was like and seemingly had no issue. No other game I play seems effected.