Symptom: Roon server (with ROCK) can not be found with Roon apps, it did response ping but Web UI was not available. After reboot, it get back to work.
CPU: intel J3160
DRAM: DDR3 8GB
System Disk: SSD 256 GB
Roon OS version: 1.0 (build 174) stable
Core version: 1.6 (build 401) stable 64bit
a PC with samba server enabled as a storage connected with GbE to the Roon Server machine. The player a COS H1 DAC connected to the USB port on the Roon Server machine.