Galaxy S3- Some LTE coverage and no reception at all?

I bought my Samsung Galaxy S3 - 16gb from Bell around 2 months ago, I live in Calgary. The area I live in is fully covered with 3G and LTE, but sometimes it switches from LTE to 3G automatically for some reason even though LTE is everywhere I go. Other times I lose all reception and it says "No service" on my lock screen and/or lose my mobility data connection and I usually have to restart my phone to get it back or move away to another place, this has happened inside and outside.
I know Galaxy S3 has been having problems with their reception and they are working on a fix that might come in the next 4.1 Jelly Bean update but is it Bell or Samsung? I know Bell has good coverage and service so Im not sure what to do.

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Try Settings -> System updates -> Update them all weekly, restart phone.