USB issue

Signature 22MT US Mixing System Model: 5049563 S/N: 616120DS
Hello, the information above is my mixing console that I need help with. My Soundcraft Signature 22 mtk started acting funny for the first time today. When the USB is connected to my Macbook Pro, something is not acting right within the Lexicon FX and the two FX Returns. When raising the volume of the FX Returns channels the console starts making a constant pop noise continuously every second, like a heart beating, and when I press either one of the PFL buttons ONLY on the FX Return Channels the meter display bounces, hot, up & down with this weird pulsating sound. When I release the PFL buttons the meter stops bouncing though the pulsating sound is still heard. In addition, while this problem is occurring, I’m unable to select any FX from the Lexicon processor, its frozen, and my MacBook Pro is not recognizing the Signature 22 anymore as well. Now, when I disconnect the USB from the mixing console everything seems to go back to normal and I can select FX and the pulsating sound is gone. Once I plug the USB back in exact same issue. I’ve tried restarting, unplugging everything and restarting, rebooting, trying different usb ports on my MAC, different USB cables, etc, even a parameter reset on my MAC. Still same problem. Can you please help ? Thank You, Donny

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