Temperature changes seem to effect my wifi

I have 6 months of reliable wifi in the spring and fall, and 6 months of unreliable wifi in the winter and summer...I have had 2 techs out and have switched up things inside, new modem, etc...it has to be something with the line going up the house and to the pole...they never seem to want to mess with that line, these things can break and wear over time...and then the line starts expanding when it gets too hot or too cold.  What I have noticed also is it will go out around the same time everyday, and the only fix is restarting the modem...I shouldn't have to restart a modem 3 or 4 times a day.  They should prioritize the line outside that goes from the house to the pole on every report of disconnecting wifi.  Except it does say its connected but multiple devices like tv watching netflix will lose connection.  That seems to be their out, they say everything looks good on their end.