Its not Ex Machina, but has some similarites. The movie is obviously longer but this is what i remember:
In a remote house someone is trying to connect with the outside world but there are some technical difficulties. The only bridge that connects the house to the exit doesn’t seem to work either.
spoiler
The person realizes they are just an AI stuck in a simulation. Thats why they cant get out and cant connect to the rest of the world.
Movie is therefore similar because of AI with Ex Machina, Moon, Welt am Draht
Thats not the one but seems very interesting. I guess it was a good idea to ask questions like these, to get even more movie suggestions.