Hello! I picked up a used Qu-16 about a year ago. It’s been behaving nearly flawless, but I immediately noticed some phantom input signal indication on channel 5 with no inputs or outputs connected. There was no audible noise on the channel - until the last show. Now it makes a clearly audible crackling sound, with or without a microphone connected. With the mic, you can hear both the crackling and the voice. Crackling stops when the channel is muted. Otherwise it is audible on every output.
Has anyone had and resolved a similar issue? Thanks!