Thanks for bringing up this issue regarding 403 errors! I faced a similar problem with one of my websites where specific assets were giving 403 errors randomly. It took me a while to figure out that the issue was related to server permissions. After tweaking the permissions and making sure all assets were properly accessible, the problem was resolved.
By the way, if anyone’s interested, I’ve implemented some of these solutions on my site https://letmewatchthiss.com/, and it’s been working fine since then. Maybe it might help someone facing a similar issue.