I have a Solo 4 which shuts down after being on my dash for about an hour. The sun was bright with an outdoor temp of 48 degF. The unit beeped like the battery was low and shut down. It was somewhat warm but not HOT to the touch. I let it 'cool off' and put it back covered by a white napkin from a drive thru. It stayed on the rest of my trip...over an hour.
Is that normal...or is in indictative of a poorly operating unit?