this problem has been introduced in a driver update around march. but it has been fixed for me (lenovo x1 yoga) in the latest synaptics touchpad driver update v19.3.4.97 [0]:

   [Problem fixes]
    - Fixed an issue where Touchpad Driver might cause high cpu usage of
   "WmiPrvSE.exe".

[0] https://pcsupport.lenovo.com/ch/en/products/LAPTOPS-AND-NETB...