eM Client does not wake up after clicking the icon on the taskbar

v. 10.0.3266 (7060eea)
Window 10 64bit

My typical everyday scenario - single-clicking the icon on the taskbar to open the client - doesn’t work after upgrading to v10. It waits for 1-2 minutes, then shows up (which is so annoying and unproductive). Other icons/apps in the taskbar work as usual, with no delay. It happens every time I don’t use the client for a long time. The system is new, everything works fast, there’re no freezes at all.

What’s that? How can I fix it?