I shall be grateful if anyone can shed any light on a mysterious problem on my wife's 2004 RX300 (44k miles). About 5 or 6 times in the last 8 or 9 months we have experienced, in normal driving, a very loud bang, or rather a crack like a stone hitting the windscreen, at which point the radio goes off and stays off. It will come back on later or the following morning as if nothing had happened. Lexus suggest taking out the radio and sending it away, but I don't feel the radio is the root of the problem, but perhaps some sort of electrical short or faulty relay. Has anyone had a similar experience?