Is it possible that part of your trip happened after the cut-off point for the 'nightly' process run? That starts at 1pm PST/9pm GMT. While possible, it also may not be the case. I lost a huge portion of a 300km trip the other day. I've since had other trips show up in my archive, and it wasn't anywhere near this cut-off point in the day for me, so I know that I've lost that portion of my trip for whatever reason. Strange, because I haven't lost a trip in a pretty long time. Been fairly stable recently, and this was why I had decided to undertake longer trips again. And then one of my longest in a little while gets a huge chunk of it lost. It's pretty annoying for me, because in some cases, such as this one, it was a trip I made for no other reason than to Waze it because I was bored. If I had been out there for some other reason, and Wazed it as a bonus, it would not have been a big deal. Sucks when it's a Waze-only trip and it gets hooped.