Hi all, how are you all doing? Today, I took my first e-skateboard Carbon GTR Street for the first ride. Pretty cool experience - I must say. Much to learn and I look forward to it very much. However, upon reaching 17kmh, bang on 17kmh, I feel a vibration throughout the board. The vibration dissipates upon reaching 19/20kmh. Only at speeds in this range [17-19/20]. Battery charge was around 30%. Tightened all bolts and took out again just now. No change - the same at 17kmh. I think it also happens when I accelerate, if I let go and just cruise at speed 17-19kmh, no vibrations. Otherwise no complaints. Majestic ride. Could the drive belts or bearings be the problem. Or such vibrations is something of a normal? Any ideas anyone? Ps. I haven’t charged the board not once yet. Just took out of the box and went for a ride. Don’t know if it is relevant... thank you very much in advance.