It doesn't effect everyone, and i haven't had it effect all of my motors. Basically, it isn't unusual for the pins for the sensor connector to become detached from the board. Sometimes this happens with heat - i had one motor that would run for a couple of minutes and then stop. Let it cool and it would be fine!! Traced to sensor and it was sorted.
There are a few ways around the problem. You can run a hot soldering iron over it from new - if you are comfortable doing it and have small enough iron. Or you can just run it and see what happens. There's every chance you won't get a problem. If it does go down - you can either repair is as above, or buy a new sensor module.
Note, only attempt to (re) solder to the board if you are very comfortable doing it. I work in this type of trade, so it doesn't bother me, but wouldn't want someone to try it and make it worse.
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