Lenovo laptops have problem with graphic card drivers and Multiple displays.
When PC goes to screen saver mode it lost all Windows positions. In our company is applied Group policy and not all configurations options can be changed.
First try to fix it: in regedit search ScreenSaveTimeOut and set to huge value.
Fix is not working because you should do app which changes this value and execute it after each company group policy synchronization.
Use same type of cables. E.g all monitors should use HDMI or Display port but not the mix of them.