You've got a drop in ad similar to what to what Sling, Direct TV Now, and some other streaming services drop into programming. Sounds like your cable co. is experimenting. The blue circle than the crappy SD video means there is delay pulling from a remote server. Are your cable provider and internet provider the same company. The other possibility is Tivo is experimenting and maybe you weren't supposed to get the ad.Just got a new Bolt and I thought I was going crazy. When I play a recording the screen goes black with the spinning blue circle for a couple of seconds, then an advertisement plays for about 15 secs, then the recording starts. If you go back and play from the beginning you'll see a different ad. The ones I remember seeing are for Toyota, Keurig and Amazon.
It seems you can skip the ad by pressing fast forward but it's not that seamless.