amplifier replacement?

I have a home with 6-8 tv's (depending on who is at the house) plus xfi 2gb service. Recently had issues with the internet speed, the tech came out, removed a filter that was on one line which he said was a remnant of older service, and moved a few cables on the amplifier( I do not know the model at the moment but can get it later). This got my internet speeds back to about 2gb /350mb  He was good and asked me to check a few tv's before he left, but i did not check all of them. Those I checked  all seemed to be fine and the upload download speeds were restored to the expected range. He made a comment in passing that comcast  no longer  used the amplifiers which I had (comcast installed) anymore. but since everything was working, we left it as is.

Last night I used a tv which we did not check when the tech was at the house, and the pixelation is pretty severe. I assume since it dd not have issues prior, it is one of the cables that got swapped and also one of the longer runs in the house. I have unused taps  on the current amp.

Should I try moving the one tv to a different port or is this a sign the amp should be replaced and if so, does comcast still provide these, or do I need to purchase something on my own.