MDX814

I have a 2001 MDX with Nav. The Navigation screen randomly turns on and off, mostly it is off, for days at a time.. When it pops back on, it appears to work properly, but I am afraid to test that theory too much or I will be stuck with whatever setting I was fooling around with. I'm going to take it to get looked at, but was hoping to get some feedback so I'm not going in blind. Thanks in Advance!