I had a feeling you would say something along those lines
I had my DSL disconnected as I was working away from home a lot and was paying £45 a month for internet I never used plus the phone charges, it had to go! so I am using my Galaxy S10e now for everything, it is my router and my modem, but I still have the old DSL router
if I hook the phone and AppGameKit to the old DSL router its a tad more stable but I have to enter the IP of the device, ok no biggie but this poses the problem where as android disconnects its self from the DSL router because it can not find active internet, it deems it to be a dead network and disconnects so I have to keep reconnecting, I tried disabling mobile data to prevent android finding a preferred network but that did not work
if I use just the phone then its the same it will work when I set the IP but the DHCP changes the local IP almost every time I open the player app and sometimes mid session so it will be working and then just stop and I have to reconfigure everything, its not the end of the world but its quite frustrating
That is Classic, I cant get Studio to connect to anything no matter what I try, it just refuses point blank, but to be honest I have always has issues with Studio on that old DSL router and I will take on the chin that my method of connection is not quite orthodox and the DLS router is over a decade old but it should connect to the S10 its what 4 years old.
I have a feeling its IP settings but I do not know enough about it to diagnose or fix, there does not appear to be any DHCP or DNS settings in the phones hotspot management screen so I am at a loss on how to set static IP's or even if its possible, I'll do a little bit of research and see if I can make sense of any of it but any input or advice you could give on the matter would be appreciated.