Pepe LeFrits ๐ค If PHP is firing up the dev forum and it's looking at the same database, it may have been retaining a second pool of open MySQL connections based on the configured limit for the database.
Seem to recall when this first happened I tried increasing the MySQL connection limit due to the content of the logs and some stuff on the community forum, but it wasn't fixing the issue ... but maybe two active Flarum instances were doubling up on that limit, no matter what it was ๐