The problem with offline dahsboard is fixed.
OVH Cloud infrastructure had problem with disk performance (the speed degraded 20 times).
They fixed this after about 1,5 hour.
Anyway i am speaking with AWS Amazon cloud providet to move there becasue OVH is .......
I am sorry for that problem. Keep in mind that all your rigs should be mining fine with last downloaded settings even if dashboard is offline.
When simplemining dahsboard is offline it is important to check your rigs statistics on pool website just to be calm.
Thanks for your patience and your support !