Never-ending "maintenance in progress"

My desktop PC (used primarily for development) has recently been telling me (via Action Center) that it needs to perform "maintenance". I allow it to do so, and hours later (I left it running overnight a couple of times) it is still reporting Maintenance in progress.

Task manager reports no significant CPU or disk usage, and I have separately trimmed/defragmented my disks (a 256GB Samsung SSD and separate 1TB HDD).

Can anyone suggest what might be boing on?

Solution 1:

This finally stopped when I updated to Windows 8.1.

Solution 2:

when windows display the message that maintenance in progress it doesn't mean it's defragmenting your drive, there are several other process like computer scan through windows defender, check for risky program, updating-installing windows update or any Microsoft product update and many more..