@Betelgeuse i spoke with the team on this last week - they are aware there is some malicious use of the sandboxes which locks other user out of the sandbox until the team can restore them. There is no SLA on the sandboxes for the team to fix these, they are free resource provided to the community. You can use the reservation based NX-OS or CML sandbox whilst the always on ones are down or simply spin up an NX-OS device locally in Vagrant/Virtual Box for personal use.
Hope this helps,
Please mark this as helpful or solution accepted to help others
Connect with me https://bigevilbeard.github.io
