Welcome to the forum JK1, and I'm glad that you are enjoying the bike. We've had others quite happy with the UM bikes and it was just the service issue that caused problems. Hopefully they've learnt and will continue to learn the importance of that.
Be careful bumping off kerbs, you could damage the motor. Firstly the rotors in these rely to some extent on magnetic balance to maintain centre when running, and the shock off the kerb can make the rotor magnets collide with the armature. That could lead to expensive damage if a magnet comes adrift.
Secondly, the spindles on these motors are hollow for a part of their length to carry in the wiring, so the spindle is potentially weaker than a normal solid bike one and might snap under a large shock.
Both of these events are rare, but it's best not to tempt providence.
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