I use a RCA Lyra to listen to Audible books on my 1 hr drive to work each day. In the last 6 mos. the cassette player starts making a screeching type sound after playing for 45-60 minutes. The audio still comes thru fine but the screech is bad. I've replaced the cassette adapter a couple of times with no improvement. Any ideas? The cassette player is part of the factory Bose system.