Poor FM reception once reciever warms up

My reciever (JVC RX 818V) reception on the FM mode becomes weak after about 10 minutes of working fine. Even a strong local station using a good antenna produces same result. The receiver's "tuned" icon will begin flickering and the auto mute will begin to kick in as the sound and reception becomes intermitant. If I power down for awhile and retry the same thing happens after a short time....but only in FM mode

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