Second time this month, using Google Maps on Android phone with data downloaded in advance.
Getting close to destination, Maps freezes. Wakes up after I stopped for a bit, not in navigation mode and showing locations some miles from where I actually was. Not under trees and in very flat topography so no reason to lose GPS signal. Before it failed completely, it told me to take the next motorway junction as I was actually going over the top of the roundabout.
The first time I switched to backup TomTom hardware, second time Wife took over using Maps on her phone (which worked fine). After a few miles, my phone recovered its senses. But really, worse than useless with two fails in two uses just when I was completely reliant on it.
It's nice the way Google warns you quite accurately of traffic holdups (presumably from crowd-sourcing), also the "download in advance" feature seems good.
Anyone else had these problems? Budget phone (Moto G) but I don't see why that should cause the trouble.