Thanks for the hint, I just tried switching to 'prefer 3G' instead of 'prefer LTE', but unfortunately the same result, I'm staying at the same spot in the house but the signal bar keeps changing between two to five! Sometimes even one bar or no bar
I got the exact message too, didn't even read it (it lost its purpose) after seeing the URL posted is not related to publicmobile.ca, deleted it right away. I reported to moderator, they're aware and looking into it.