Last night, I discovered a problem with my 22-2. About halfway through a reel, a squealing noise begins to emanate from the left-hand reel while recording. As the tape advances, the squealing gets gradually louder, and a minute or two down the line, it starts printing to the recording (I’m mixing down from my computer), and in direct proportion to the severity of the squeal, the fidelity of the recording degrades to lifeless and filled with crackling textures... Any clues as to what this means, and whether it's an "invest in" or "chuck to the curb" problem?