iSub stopped working

Just curious about this.
iSub stopped working today for one of my users. I too, tried on my iPad and got the same results: It showed Zero folders.
Android apps were working fine. Desktop was working fine. Only iSub was not working.
A reboot fixed the issue: But what in the world could have caused a single app to not work?
Five other people were happily streaming at the time so everything else seemed to be working perfectly.
iSub stopped working today for one of my users. I too, tried on my iPad and got the same results: It showed Zero folders.
Android apps were working fine. Desktop was working fine. Only iSub was not working.
A reboot fixed the issue: But what in the world could have caused a single app to not work?
Five other people were happily streaming at the time so everything else seemed to be working perfectly.