Fair enough, I just wanted to respond to your question regarding consistent service. The majority of wireless users (I am not saying you are one of them) expect a landline/hardwired experience from their wireless  provider when this is not possible or reasonable.

When you state it has changed from what it used to be previously, that is where what was mentioned may come in to play as these things change, and while I realize you don't believe it to be any of the things mentioned-- these were just examples and certainly 1 or more of these items that have recently changed could in theory affect service to the degree you describe.

Ultimately what you can do to get a definitive answer is speak with Tier 2 technical support over the phone with the intention of submitting a network (NRB) ticket that will have them look at the things mentioned, among others. Ultimately they will give a determination on the issue and I have even seen instances where they have sent technicians to tower/switch center locations for analysis of equipment (and have even seen where they have determined a piece of equipment needed to be replaced). This is what I would recommend doing though, if it were me. Good luck to you