Did a quick search:
Between the threads you can see, and the elevated threads and messages in other places; I have a different point of view of the issue than you do it looks like.
During many discussions about Uniden failures, removing the detector from the windshield when not driving was a common non-sequitur "response" that didn't address the initial concern. (Whether people actually do that or not is another story)
It's not meant as an "unfair speculation", but to support that the issue @STguy was curious about was not unheard of and that he should get it replaced/fixed/etc. rather than second guess his concerns. I know two people that have experienced it with their Unidens during summer temps.
Is there a main thread detailing all these heat failures similar to the G2 failure thread? I don't recall seeing one but I of course can be wrong. I saw a few here or there with problems but nothing to cause concern overall. Then again maybe it's on an elevated thread and other places. Are there many reports of this to really concern anyone? I don't even know more than two people that have Unidens outside of this forum so that's kinda concerning if it's that common and news to me.