We’re experiencing an outage with our API and have identified the issue but some will experience downtime or slowness with projects. The team is working on a fix. You can find updates as they come on our Status page here: Glitch Status - API outage causing project downtime or slowness
Update: this has now been resolved. If you continue to see project downtime, contact support at https://help.glitch.com with the name of the project. Our apologies for the trouble!