Hello!
Its very difficult to try and get pics of this happening or a video. All I know is that it happens every time just before or after top of climb, my speed resets to 0 and then I have to manually bring my speed back up. If I'm not paying attention at the time this happens, I'm sure you can figure the rest out.
Another note, not sure if its related or unrelated. I am having a problem with oscillating throttle on climbs.