There have been problems that stemmed from cable that only poked into the female connector when sun was shining on the cable. This would mean that you would need to make sure the center conductor at both ends isn't too short. A proper f-connector termination should have the center conductor protruding beyond the nut of the connector.Temp.and humidity seem to be non factors.
As the TS made clear, the problem was with wasps in the feed horn. How Shaw processes or multiplexes their video doesn't impact the strength of the satellite signal.The likely problem is with Shaw (Bell has this problem too).