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I'm having the exact issue as well. It's been two years since this initial post above so apparently DirecTv hasn't solved the issue. I never had this happen with U-Verse tv service, but we just had Direct installed on Thursday and this message has come up at least ten times. In three days! I would say four days but the first indication of trouble to come was on the actual installation day when the technician couldn't complete the install due to Direct's own system being down. They left for a couple of hours to do another house and called later to let me know the system was still down. So even though we are night owls who work seconds, we had to be up at 8am the next morning so they could complete the installation. I told my husband I hoped that wasn't a sign of things to come...oh, how painfully right I was it appears!
I have the highest residential speed ATT offers, I believe. The turbo max one, so I don't understand how that can be the issue. We don't have problems streaming on our computers, even when all three of us have devices going. My daughter and I can be watching movies on our laptops and my husband watching YouTube on his tablet all at once with no problems so this makes no sense!
Don't waste your time responding to the "expert"'s questions. This is a chronic DirecTV problem. I have a 345Mbs download connection and still got these "slow Internet" warnings. Hasn't happened for a while, but it always comes back.