Getting a 408 HTTP Timeout Error – How to Fix It? or What Causes a 408 HTTP Error and How Do You Reso

Long shot, but are you on shared hosting? 408 http errors can happen if your neighbor’s site is hogging resources.

Upgraded to a dedicated server and tweaked MySQL’s wait_timeout. Problem vanished.

Also, maybe your PHP version’s outdated? Upgrading to 8.x fixed some weird timeout issues for me.