Have you talked to mobilty tech support yet? If you're having connection issues, it is best to make sure they are aware. Are you on 5G or LTE? Do both have issues? Any other cell phones in the house? Which province or city are you in?
That being said, cellular reception can be affected by many things.
Cell tower map: http://www.ertyu.org/steven_nikkel/cancellsites.html
For me, I know where my nearest tower is and the signal from it has to go through about 6 blocks worth of houses before reaching me. The last obstacle I have is the condo building itself as I have no direct line of sight and have half a building between me and the houses.