My power line goes to a shop building not attached to my house, but the power line is the same. Until recently, I had good internet in the shop. 20M download, 5 upload. (satellite internet) In the last week or so, my download dropped so low that Speedtest won't run. Since my TP-Link equipment was over ten years old, I decided to get a new set. It arrived yesterday, and I used it today. The upload speed is now good like before, but the download is better but still terrible. Maybe 2-3M. When I bring the adapter into the house, the speed are good. I assume something has changed on the power line going to the shop, but I don't know what to look for.

Any suggestions?

Fred