Roon air wifi connection problem

[h9151105]

I am using a notebook with Windows 10 and Roon Core in it. I have the wifi connection btw my Devialet D-Premier ( firmware 10.1.0) and Apple Airport Extreme Router. The router is 2m away from the Devialet and I am getting a signal of -32 dbM, which results to dropouts after couple hours. Also 24 bit 192 Hz files cannot be played properly.

What I did is, to place the router right next to the devialet and the wifi connection is getting even worse.  (appr. -52 dbM).
Do you know the reason? Or how can I improve my signal?

I also tried to make hardwiring connection via HDMI cable but windows did not recognized devialet as a sound card.

Thanks for your helps