Ls400 Radio Problem

[artwalk]

The radio in my 1992 LS400 has an unusual problem, in that it only works when it feels like it. In other words, it usually does not work (99%) when i get in an turn on the ignition, but may come on within 10-15 minutes after driving, but not neccessarily so. I installed a new arial a couple of years back and it worked perfectly for a year before developing this unusual habit. There doesn't appear to be any particular reason why it comes on when it does, as to location or area etc, it can be anywhere at any time. Does anyone have any idea what this is. Prior to the radio playing up, the CD player also gave out without any notice, not something you expect to lose in a Lexus, both the radio and the CD player.