Not a T type, answering anyway.
I cry fairly often. In fact, I've probably cried more in the last 12 months than the rest of my adult life combined. I try to cry from laughing at least on a weekly basis.
Most of the time I would say it's from frustration, or feeling defeated and overwhelmed. Full on sobbing is usually from sadness though, that happens less often. After a breakup this summer I would go from feeling fine to sobbing 15 minutes later. It would be like a wave coming over me and I couldn't control it. Lately I've mostly been stress crying, which is a lot less intense.