Random 404 errors

My project at https://dailyworkout.glitch.me has been working perfectly, until this morning.
Sometimes the page loads, and other times it does not, and if I look at the developer console I am getting 404 errors, but for different files each time.
I don’t see why this would be an issue with my code, so is this an issue with Glitch?
Also, I am being bombarded with emails from UptimeRobot each time that service encounters a 404.

2 posts were merged into an existing topic: Ongoing project instability and page not found / 404 issues