Keep reporting these cracks to the POA. I'll bet they are in the data collection mode. It will be interesting to see if they are collecting the data by house location, year built, model, etc. The wrong answer is this is to be expected because of being exposed to outdoors. A cold day here is in the high 20's. For years I have closed my house up north with no heat (drain pipes) and temps reach minus 30 and only had one hairline crack. That was due to over five feet of snow on the roof.
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