Maybe Ive just been lucky yet I have a cheap JVC receiver that has been in my garage since 1999. Dallas, TX area where temps in the garage can reach 110 with humidity in the 90% range. Winters aren't overly cold yet damp. Darn thing has never skipped a beat. Nor has the CD player under it... Gets dusty is an understatement.
Then again, I had a Samsung plasma within my enclosed patio and it stopped producing a picture within 18 months.... Everything else works on the TV yet it's like the bulbs burnt out (not suggesting plasma has a bulb by the way).
I'm 50/50 on what may have caused your / my TVs issues, but I do feel "stuff" just ain't made like it use to be and is entirely too flaky, OK "sensitive" to anything much more harsh than the vacuum of space... Less the temps that is.... :-). Partially kidding of course.
I too would probably protect your next device by storing it out of the elements to see if that achieves longer life. Maybe that and ensure you are providing it with a good, stable power supply while outside.