Roon stops Playing After des seconds

Roon Core Machine

Node

Networking Gear & Setup Details

Synology DS720
Intranet - Bluetooth

Connected Audio Devices

Node

Number of Tracks in Library

7000

Description of Issue

After beginning to Play the Track, Room Stops playing it. I restarded all the System (NAS, Blue OS, Node , …) I can Listen music on m’y Node player Without Problems.Just playing Roon does no longer Work…