I share your pain Wenger2015. All that money on equipment and the whole thing is ruined by the fact that one's digital source component is unable to establish a stable connection to the router. I use a computer audio setup and establishing a stable Wi-Fi connection proved to be an absolute pain. I'm aware that in the UK Doctor Who, in his David Tennant persona, will tell you how wonderful Wi-Fi is. It isn't! The best way to connect one component to another is with a piece of wire. Someone suggested that I get one of these:
I figured that for less than £20 it had to be worth a try so I bought one and it has solved my connectivity problems. For sure, it's not as stable as using an Ethernet cable but I wireless control of my computer audio setup using a Samsung Galaxy tablet. Might be worth a try for you.