Thank you for your reply!
Sorry to hear you couldnt fix it. Did you try to keep icreasing the server specs? It feels like it gets “better” when I switch to more CPU/RAM but its not “fixed” for me, just less often.
Right now I am thinking about increasing my server specs on render to the highest plan just for deployment and then switch to a less expensive one after. But this does not feel too good 
…
When you have MariaDB now, you are not longer at render.com?