I'm using stock ROM. Well the stock ROM that Sony installed on it with their UI skin and then Rogers branded for themselves.
I live near Dundas & Third St intersection, north of Dundas. The LTE coverage was solid until the snow storm.
And ya I once encountered the deadspot while eating a restaurant owned by a family friend on Hamilton road near Trafalgar Rd. Not LTE, not even HSPA or 3G, I was connected to EDGE (I believe thats what the E stands for on my device).