It seems they have fixed the issue, now it is ok, no packet loss.

Thanks for your response, now the maintenance message is gone but I am still experiencing 50% packet loss to cml node via sandbox.

Definetely something is wrong, I have been trying to access Cat Center Reserved Lab there is a huge packet loss, I tried to use a VM in the USA, near Cisco DC but the result is the same, can't get access to CML, ISE or CatCenter. 

Parabéns meu camarada!