Noticed this being discussed on a couple of Reddit threads too and honestly the timing is suspicious. I was out in Shropshire with a group doing photography during the eclipse and my signal dropped completely for a chunk of it, thought it was just network congestion from everyone streaming at the same time. But apparently people in completely different regions with different carriers reported the same thing simultaneously, which rules out simple overload imo.
The thing that gets me is the 20 minute window specifically. Thats too precise for a coincidence. Network congestion tapers off gradually, it doesnt just cut dead and then come back cleanly.
Could be something mundane like the towers switching to a backup power cycle or some kind of coordinated maintenance that nobody bothered to announce. But if anyone has actual signal logs or screenshots from that window I'd genuinely love to see them, that'd be the kind of hard data worth building a case around rather than just anecdotes. Anyone here actually document it at the time?