On 5/28/2018 7:11 PM, nospam wrote:

try the same bluetooth mouse with other computers and other
bluetooth devices (if you have any) with the lenovo.

My Bluetooth mouse does the same thing on both the devices (Lenovo
laptop and Acer tablet/keyboard) I use it with. It feels like the mouse
goes to sleep while being neglected and then when next used takes a
second to wake up. I figured it was for battery longevity? The
occasional slight delay never bothered me that much so I've never tried
pin it down.