My stock radio has been temperamental lately. In the morning, when I start the car, the radio comes on just fine. Then, if I stop the engine and remove the key, such as for getting gas, when I turn the ignition and start up again, the radio is dead. Sometimes a good strong whack or two (or three) will bring it back to life, and on rarer occasions turning it off for a stretch of time, and then turning it back on, brings it back to life. Would appreciate any suggestions on dealing with this crankiness.