thanks for the reply, it has been exactly like this, at the beginning it worked on and off and I was not too worried, now it's impossible to connect.
Thanks for your suggestion about an external streamer, I will do that as well since I am at a dead end now and the rest of the NT-505 is of good quality. Theoretically, I should opt for a streamer without dac as not to pay extra for something that is already there.
It's funny that I acquired NT-505 to replace a number of previous separates. Afterwards I bought a headphone amplifier (HA-501), and now a streamer :)