Have you got a Garmin or something equivalent? I am running a Edge 820 with the Garmin remote and it works perfectly with the Levo. Shows which mode you are in as well as changing modes / pages.
I have experienced loss of drive and simply turning it off and on again worked. It did fail when doing as you descibed, just randomly stopped when you stopped 2 min break.
It has only done this a few times over the past year...
I was going to replace my SRAM PCX1 - stock Levo chain - with a KMC x11e but a couple of guys said don't bother. I am now going back to the stock chain which to be fair has been ok.
Why are you changing the chain?
Took my old faithful 2006 Schworks out for a spin today, first time I have done a proper ride on it in years.
What I noticed was
- how light, made such a difference,
- little wheels, it turns in so quickly - no effort needed,
- the gears, 3x9 Shimano XT setup and they shifted so smooth...
I have charged my Levo whilst driving inbetween trail centers using a handy mains - 12V to 240V adaptor. Alternatively if out camping with no hook up, a leisure battery coupled to a solar panel seems like a good idea.