I have a 2004 TSX w/Navi and for the past couple weeks I have had an issue with the Nav screen restarting. On Thursday I drove for about 2 1/2 hours straight and it never turned off. On Saturday the way back, about 30 mins into my drive back the nav screen restarted, and kept rebooting when I tried to continue with the directions it was set for. it would re-plan the route to about 40% then reboot, this happened about 4 times. i eventually cancelled the directions and started from scratch, which got me up and back on course, but it cut out again a few minutes later. This problem has also happened at night and i noticed the headlights went out for a split second and the radio cut out for a split second too while it rebooted. now i do have a PA15-HON2 hooked up and i have had it for about 2 or 3 years. its never been a problem before so i am not sure why all of a sudden it would be causing a problem. and my battery isnt that old, less than a year and also had it checked out and Mr. Tire said it was fine. Anyone have any issues like this?

 

Same thing was happening to me. In my case, my AC and wipers stopped working when it rained. Turned it was a loose ground wire that was poorly attached near the bumper. The nav was on that same ground, from what I understood. Never had an issue once it was identified and fixed. Good luck!