All good suggestions, Hungx. I don't have any other device to confirm LTE, or I would have tried that already. I don't think that T-Mobile is doing maintenance on their towers, because it's been over a month now. I think it's that update pop-up that says something like "Your data provider has a new update". We kept closing it, but it keeps poping up, so we just hit the OK button. It then disappeared. I didn't see any download or update after that, but the problem started then with the slow connections. I'll try pulling out the SIM card. Thanks.