Yeah had (exactly) the same problem with someone else also.
I'm wondering if there was a network issue in SG somewhere?
(that fixed itself)

SG hash rate stayed up about 87TH but that meant of course there was a drop out of about 30TH (you and the other person)
I'm always connected (from Aus) and there was no drop out from here either.

I guess we'll have to see if it happens again, and make sure you run an mtr/traceroute