Yes Alan, that is exactly what will make the difference! If you put another window in the front the browser will become inactive. This is the cause, we got there eventually 🙂
You need the screen on and can have several browsers running in the foreground as long as you position them to all remain active.
There are some cost effective vps options but if it doesn’t feel like an preferred option then totally not required, it’s just good to have options 🙂