Nah coins for me are back prolly it was an older backup when you checked your balance and stratum seems it's back up and hashing. I had like 900 xvg in there, it showed 0 for a while and then it showed 900 again
P.S Managed to withdraw my xvg out of the pool. Seems that everything is ok with the funds etc and it must be some kind of server issues i suppose.