Stutter during playback while recording

I've been having intermittent issues with weak signal here and there, which seem to have been cleared up.

Now I notice when the box is recording, that playing back that recording or other recordings, the playback stutters.

I have an X1 4K box and I thought these were supposed to use SSD drives. From the sound I hear, it sure sounds like a spinning drive which is why I can understand the stutter if it cannot keep up. My resolution is set to 4K60.

I noticed earlier when not recording, everything looked great but as soon as the shows started recording, the stutter kicks in.

If I watch on another remote box, it seems to have no problem though only playing back at 1080p.

I've had this box changed out once from my earlier issues. It is better overall except for this issue.

If I stream the same show, say on Peacock during a recording, I have no issue. Thinking of ditching DVR and just using on-demand and streaming for now.