Yeah, which makes sense. The simple reality is that we have lots of different kinds of GPS direction & location finders in our lives and satellites require line of sight. Manufactures build in some kind of dead reckoning system to fill in the gaps, and no such system is perfect in the best of conditions, let alone extended "blindness". Even clouds can block sats at times. I just think Mr. 100 was either flying on a cloudy day, he was between some mountains, or at some point, he crashed his drone hard enough to knock the receiver haywire.