I have a Variax 300 electric guitar which I am powering with an XPS Mini. The guitar has been working decently so far (with some crackling issues with some of the modes), however, recently I have started having the issue of no sound coming out of the amp when I play. Once I unplug and replug the cable the sound comes back, but only for a minute or so. Due to the current lockdown I cannot really seek professional help but I really want it to work again. Any help would be greatly appreciated.