Time Warner Cable
USA (Indiana)
Seen it happen Monday and Wednesdays

Normally when this happens my whole internet (but not modem) seems to crash for a bit on my computer while playing FF14... but when I stop playing it, I do not have these issues (I've got a big sample size, it's not a coincidence).

Today I had it different, just hard lag where people were standing still for a few seconds, then moving for one, and so on and so on. Smooth Internet in all other forms.