My S20 FE has done this 3 times now - it switches itself off and won't turn back on. Has anyone else experienced this? The past two times were when I was plugging it into the car but today it did it in my bag. I am especially concerned as it's my satnav and I don't want to be left stranded! And today I was really worrried that it wouldn't turn back on again at all - it switched itself back on after an hour or so (I was charging it but it was 85% full when it randomly turned itself on, so it isn't a battery issue).