Lexmoto Vienna "wobbles/shakes" over 30mph

Hi All, new to this forum but hoping someone can help me...
I have a Lexmoto Vienna 125 (2016) and suddenly it starts to vibrate/wobble above 30mph
I have checked and the wheel bearings seem ok. when I turn the handle bars and hold the front wheel there is no excess movement. wheel is balance ok. Suspension also seems ok
It is a slightly weird sensation, almost like something is disconnected but everything seems fixed/tight

Any ideas would be helpfull...

thanks in advance
Richard

 

Tyre out of shape maybe.
Have an MOT tester check it over

 

How old are the tyres? As Stevep said, they may be out of shape/flat spotted, or misshapen just due to age.