Every so often - the source "IPOD" is not detected which was the channel the VLINE would play audio through is lost. Only way to recover is do a hard power reset on the controller. Any ideas?
Try to update the system to the latest available firmware and see if that will help. Here is how to: https://youtu.be/UrQ2TWJ5v1Q
If after the firmware update you will keep experiencing difficulties, please contact our technical team at https://gromaudio.com/support.html and we will review further.