Yeah I caught this too and it's been bugging me since. I was cross-referencing FlightAware with ADS-B Exchange around 9pm local time and there's a solid 23-minute gap where transponder data just drops out across a pretty significant chunk of airspace west of Vegas. Not a glitch either, the surrounding sectors stayed clean.
What gets me is the timing. There were reports on the NWS surface observation logs of unusual cloud formation activity in the same window, which could mean absolutely nothing, but when you layer it on top of the radar gap it starts looking less like a technical fault.
Has anyone pulled the NOTAM archives for that date? There was nothing filed publicly that would explain a blackout that size. I've seen scheduled military exercises cause local ADS-B gaps before but they usually leave some kind of paper trail. This one's got nothing.
Would love to know if anyone in the area actually saw or heard anything that night. Ground level reports are always the piece that ties this stuff together properly.