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I'm just revisiting this thread in case the eventual outcome is helpful for others. While it looked like fitting a new controller had resolved the issue, it turned out that it hadn't. After much investigation, I finally determined that the problem was an intermittent connection at one of the...

Turns out it was a defective controller. Now replaced by new controller number four. Fingers crossed.

Just to report back on this: a new controller unit (the one adjacent to the battery at the rear, not the front display unit) appears to have corrected the cut-outs. Not conclusive, but OK so far. (So, that's controller unit #3 and counting, and another week off the road for the bike.) With the...

Thanks for the responses, folks. To summarise: it could be anything. Is there a workshop manual available for this bike model that would assist me with conducting some diagnostics of my own?

I've concluded that the display unit is likely not to be at fault. It's been throughly dried out and works fine until the fault starts to present. Instead, the fact that it takes ~10 miles for the fault first to emerge after a recharge suggests that it's a battery issue. Switching the battery on...

Yes, I'm sure it is unusual. The bike certainly gives the impression of being a generally good quality product, so I guess we've just been very unlucky. The frequent issues have meant that it has not been a good ownership experience. Anyway, the display unit is now detached from the bike and...

I used the hairdryer carefully for several minutes, without letting the display unit get too warm. The net result is that we managed about 10 miles before the first power cut-out. We'd also kept the bike inside overnight in a warm, dry house. So, this supports the hypothesis that the display...

Thanks for the response. I'd also wondered about water ingress into the display, since there was a small amount of condensation evident on the inside of the face of the display. I'll point a hairdryer at the display unit for a few minutes to drive out any moisture. If there's been no permanent...

My wife has a late 2016 Wisper 705 Torque with the 575Wh battery. Recently she's been experiencing frequent power cut-outs, with the following symptoms: The battery indicator on the controller disappears completely ... i.e., the outline of the battery and the battery bars disappear, but the...