T mobile internet is working perfectly

I started using T-Mobile internet in mid-August, was getting 3 bars, but was getting 600-700 down and 20-30 up. Loved it, way better than dealing with Comcast. Last Thursday I went down to 2 bars and my speeds dropped to 1mbps down and 0.8 mbps up. Unfortunately I had to go back to Comcast, I need something that's reliable. 

I called T-Mobile to return the gateway. They let me know upgrades were going on in my area which were causing the issues. I agreed to suspend my service for 2 months for free, as opposed to returning the gateway. This way I can continue to monitor to see if the signal strength returns or gets better over the next couple of months. Honestly I feel they are just telling everyone that their area is being serviced as an excuse and to keep them as internet customers. I guess we'll see over the next couple of months. I was impressed over the first 6 weeks and I'd rather give my money to anyone rather than Comcast. But, if it isn't reliable, than it's not worth it.