English: Increase {max_connections}, or decrease {wait_timeout} so that connections that do not close database handlers properly get killed sooner. Make sure the code closes database handlers properly.
Dutch: Verhoog {max_connections}, of verminder {wait_timeout} zodat verbindingen die database-handlers niet netjes sluiten, sneller afgesloten worden. Zorg ervoor dat de code database-handlers netjes afsluit.