1300 miles on my Crossfire e...and touchwood, it does occasionally cut out, screen goes blank and no assist, I usually just press the 'on' button on the screen (while I'm still rolling) and it re starts....I guess in 1300 miles, it's happened maybe 10 or 20 times, not that often.
I've yet to take off the velcro and have a look at the motor connector... maybe in spring I'll give the whole thing a good clean and inspection, I'll be looking at the sensor on the crank as well, give everything a good look over.
Been very happy with it and I wished it didnt have this issue nagging in the background...,but then the option is to pay another £500 or so and get a Bosch powered bike. Not an easy choice is it ?