I've started my ride with previous route.
it worked for about 1h, later Edge 840 started to freeze (for 10-20 seconds) and didn't respond too much
https://www.youtube.com/watch?v=yL-5N30EqVk&ab_channel=razorree
you can see it here, I've disabled routing later and Edge started to behave normally.
A bit shame that most basic/obvious options doesn't work....
I had to rely on my phone later... I didn't buy Edge for this.....
(v19.21)