Major pixelation on some channels

Hey all,

We recently moved from an apartment to a house and we transferred our services (TV and Internet) over to the house. We opted to keep our current equipment and just activate it once we moved. That was two weeks ago. The past two weeks we've been having major issues with our TV with certain channels being super pixelated and skippy. It happens at times with live TV but we really notice it on DVR recordings(not all though). Of course we watch a lot of DVR stuff because we're pretty busy so we don't have much time to watch a lot of live TV. We notice that our shows on Discovery channel are infamous for having this issue. Our internet has been solid from the start. We have checked all connections, have even bought new RG6 heavy duty coax cables, bought new HDMI cables, and tried changing video settings to a lower quality on the X1 boxes but nothing helped so far. We even had a Comcast tech out a few days ago to check our lines outside due to this issue and to drop off a new X1 box that replaced a X1 box that continuously errored out making it useless (it was not the main DVR box). Regardless of what X1 box we try to watch the DVR recordings on, it's the same issue. We tried test watching some DVR recordings on the Xfinity Stream app on our smartphones and the recording playback is perfectly fine on there. This theoretically means it seems to be tied to a main box issue or a line issue. There is a main line that comes into the house which hits a 8 port splitter. The splitter is a better quality one (or so we believe) and is newer. The splitter is this one:

https://www.amazon.com/dp/B00DIGACBU/ref=cm_sw_r_fm_apa_i_c8g3EbV04RM3S

For the few (2-3) unused splitter ports, we bought some line terminator caps to help prevent signal loss. They are these:

https://www.amazon.com/dp/B07VWHX2FS/ref=cm_sw_r_fm_apa_i_g.g3EbCMRN31K

With the COVID-19 stuff going on right now, a tech can't come in the house and check the signals of each line so that isn't great news for this issue because it's hard to isolate the issue without knowing the SNR of each line.

Here is an example of the issue from a very recent DVR recording from Discovery channel:

https://youtu.be/m1SvViY4MCY

Based on the details here, do you have any recommendations on what to try until a tech can come in and check lines? They won't let techs come into a house right now unless your service is completely out. Any thoughts are greatly appreciated. Thanks.