I too am having an issue. When I power on the ultra the amp comes on as expected. When I power off the ultra, the amp stays on. The cable is not the issue as I have tried several. If I unplug the trigger cable from the ultra, the amp switches off. The amp also has signal sensing that will see the signal from the ultra and switch on. After 12mins of no signal the amp will switch off, however the amp will randomly switch on with no input from me. Really annoying. I hope someone can help. I have raised a ticket with wiim.