I have been having an issue where every once in a while ( every 1-2 days ) some users ( but not all ) experience issues with my forum (www.maagia.org
Namely going to www.maagia.org
Internal Server Error - Read
The server encountered an internal error or misconfiguration and was unable to complete your request.
Or takes forever to load ( Chrome inspection tool says Waiting (TFFB) takes ~16 seconds )
Although when I have been having this issue then switching from Wifi to 4g connection seems to resolve it but can't confirm whether it resolves it for eveyrbody.
I'm confident that the issue comes from some code edits I did. If I installed a totally fresh forum it never has this issue and during the ~7 days of developing some features to the forum everything was ok.
Can anyone give me any hints where should I be looking for to fix this issue?