Levo Gen 2 Whining noise

[Bmwgsboy]

I have a 2021 Levo expert, after one cycle charge and 30 miles when I shut the bike off I hear a whining noise there are no lights on the TSU everything seems to be fine every time I shut the bike off and turn it back on that whining noise last for about 30 to 40 seconds then goes away. So I’m getting back into cycling so the bike has just very easy rides. I was waiting for anybody else and counter this, is this something to worry about?