I just bout a Fender Rumble 100 from Sweetwater. It seemed fine on day one, but now on day two and there is an awful buzz when I play with the volume raised at all. I have a Fender passive Jazz Bass and an Ibanez with active electronics. If I use any force at all besides a very light pluck, there is awful buzz, especially on the lower strings. This is with both guitars. I’m beyond frustrated, I’ve barely put two hours into playing this thing. Should I just seek out a replacement right away? I’m willing to tighten some easy outside screws but other than that, I’m not opening this thing up. I know nothing about electronics and am not removing the speaker etc on a two-day old amp. Any thoughts?