[1000mp] mark v field

[NOEL POULIN]

Hi 
I wonder if anybody  have experienced the same thing with a mark v field.
Sometimes(not always) when I turn the rig ON I hear three tones, or three beeps.....but the radio seems working normally.I have two Mark v and this thing is not present on the second....one...
But I should say that doesn't happen everytime I turn the rig ON.... it sounds like this   bep beep     beep. .Of course the tones are not the same (frequency)..
I never heard this before...except this morning...I tried many times turn OFF and ON but it doesn;t happen.....only some times?????Anyone with an information????
Thanks
NOEL