There are a few different errors with the 5xx format that you can encounter when reaching a website. While the 5 in the status code indicates that the error is server-related in general, there are can be several reasons why this type of errors may happen, such as:
Issues withing the website's code, such as invalid syntax, incorrect parameters, using an incomplete function, etc.
Plugins or themes causing server overload or logical errors
The hosting resources limits are being reached
Among others. To fix a 5xx error, first, double-check that it is not a local cache issue.
If the error still appears after trying a different network and device, follow the guide below corresponding to the specific error number: