Earlier today I was monitoring on my tascam, and noticed every so often channel 1 was cutting out but would come back eventually. Soon after that, nothing appeared to be coming from channel 1 and when the tape was stopped and played again channel 1 just has a constant loud buzz no matter what I'd do, it even stayed there when the input had mic/line selected (although it did sound slightly different) - it was easily +6db without the faders being particularly high. The buzz shows up on the level meters, so I am certain it is not a problem with my headphones or phones input. At the moment the buzz seems to have subsided, however when I turn the monitor level up really high all that comes from the first track is a very quiet sound - almost as if the signal is just incredibly low? I tried a very basic clean, however I don't think it is that as all the other 3 tracks are completely fine. Any advice?