Are all the doors or windows on the same side, or do they have similar sun exposure? Did you have a coating applied to any of these (to cut down on heat or provide privacy)? If so you might be experiencing an uneven heating of the glass causing stress cracking. If the windows and door are easy to open (no binding, etc.) then I would not expect foundation problems, but probably a good idea to check.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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