he most likely cause of this problem is a keypad on the control.
You can try the stop/clear keypad to silence the beeping.
You can put the controls into child lock and see if the intermittent beeping stops. The instructions to turn the child lock feature you have it in the owner manual . The child lock disables most keypads.
otherwise replace the control board.
God bless you
Keypad Beeps
Keypad Beeps can be enabled/disabled by
short pressing SB2 button (until radio 'chirps')
while turning ON the radio.
Here is a link to the user guide: http://www.astracomm.com/media/pdf/RDX_Display.pdf
Best regards.
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