After starting everything up this morning, I set the IP-address using the .bat file, configured POTH, configured Stellarium and tried it out.
It is working now as it should work.
I have no clue why yesterday everything went sideways :(
I will have to keep watch on why and when the PMC-8 decides to stop sending out the WiFi signal. I have a wifi analyzer running on my phone to check if the SSID is still there. The past 2 hours, it was up 100%