I love my HN7, it must be 5 or more years old now (can't remember exactly when i got it). It used to live on the windscreen of the 90 here in Mackay, had lots of 35 deg days. For a while it would be left on and each time the truck started it would fire up. the poor old battery has given up on it now, so wont run without power, doens't seem to affect it's operation other than the car needs to be on to use it.
I had lines like you speak of once - maybe a year ago. I thought it was the end.... but after I unlugged it and left it for a few days it started up again and no more problems. (I've lost some faith in it now and I've been very tempted to replace it, I even looked at prices!)
I would have loved to go to an in-dash unit but that is too expensive at the moment. I really can't fathom how you guys use a tablet on the windscreen of a defender, there would be no view of the road left! I do however agree that the big screen would be nice to use.
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