One time I worked for a developer in the sales office of a small-scale housing project. Every day at about 2 pm our phone system would go out for an hour or more and then come back on.
One day I decided to follow the cable where it led. It had been placed in an expansion joint in the road bed and the heat in the very steamy Houston climate caused the concrete to expand and pinch the cable, and cause the daily outage. Once the phone co. relocated it from that crack, all worked well.
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