Pre-ordered and purchased two "Silent touch" M240 from AMZ few weeks ago. But so far very disappointed with its performance. Have been giving them high hope as Logi Wireless Mouse.

Problem Description:
M240 always lost connection (mouse icon disappeared) to my Surface-Pro after Surface-Pro idling (eg. hit space bar to pause Youtube streaming then hit space bar to bring up screen again) for 30min+ although Windows Bluetooth still shows M240 is still "Paired" and battery is "full". Power off/on M240 cannot help to get connection back.
Chance to repro: 100%
Workaround:
1. Reboot Surface-Pro, or
2. Remove M240 from Surface-Pro Bluetooth list and add as new again.

Configuration:
System: Surface-Pro, 4G RAM
OS Win10 (22H2)
Device Manager shows:
M240 Bluetooth driver version: 10.0.19041.488
M240 Bluetooth driver date:
6/12/2006
Driver update shows the latest and best driver has been installed.