Okay, I have searched around for this problem for a couple of weeks now before posting this, and I did find some cases with almost similar problems, but none seems to adress the exact issue on my site.
My site runs perfectly, most of the time. But, occasionally, at least once a day, sometimes more, I get a blue page with a MySQL warning, about phpbb3 not being able to connect to the database. I would post a screenshot, but the error hasnt popped up today yet. I will return to the thread and post it, as soon as I get the error. If I recall correctly its a 2013 or 2014 error. If anyone knows what I am talking about already, without the screenshot, please do weigh in and help me
Thank you very much all