dr500gw-hd, focus goes from clear to blurry in 45 minutes

wozzzzza

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here is a screen shot of 2 files I got today, left home, drove to destination, 5 minutes from a cold startup.
parked then took screen shot of what im seeing in front of camera. (BOTTOM IMAGE)
45 minutes later, car sitting there engine off with cam still recording, 26 degree day outside. (TOP IMAGE)
does the focus get affected on these blackvues with heat or something or whats going on??
haven't really noticed this before, but I have noticed it out of focus sometimes but never really thought anything of it until today when I was viewing one file then another one a while later straight after each other.
 

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so is this normal or something or just something wrong with it??
 
well I decided stuff it, I got a head ache every time I watched the footage from it due to the blurriness, I pulled it apart the other week, adjusted focus and now its perfect. well as good as a blackspew gets any way. when cold it starts out very slightly blurry then when it gets hot after sitting in the sun for 45 minutes its spot on, way better than before.
 
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