We had a customer whose xhorse key tool plus pad every function selected was not responding. The problem was settled after a factory reset and update via Hotspot.
How to Reset Xhorse VVDI Key Tool Plus Network , App and tablet?
Select the “cloud” icon on the right top of the function you desired
Home menu
Reset options
System
Choose Setting.
Then run an upgrade via Hotspot.
https://www.vvdishop.com/service/reset-vvdi-key-tool-plus-to-factory-setting.html