Volumio doesn’t see my Plex server anymore

Hi, so recently I started to use a music streamer/DAC based on Raspberry Pi 3b and running volumio player.

I have all my music stored on home Plex server which has the DLNA enabled. It worked well yesterday, but today when I switched from Spotify to it Volumio won’t play a music. I restarted both DAC and Plex server. Volumio saw the server, but again when switched to another folder it won’t play the music. Not sure how to proceed. I can’t play my music. Should I factory reset the DAC?