Hi,
This issue just happen to one of my FC member. We were just doing our daily duties and suddenly my friend disappear. It took 4 hours to be back on the game. The reason: power outage.
As everybody said already, this didn't happen before StormBlood but now it is happening.
I'm not here to complain, just to let SE knows that one more person is impacted, so please have a look at the problem. Power outage could happen at any time, any where for any external reason.

Please SE if you can look to the problem to avoid all the unfortunate people that have power issues to have to wait multiple hours to play to their favorite game will be much appreciated