Question: When working I will have multiple windows of file explorer open at a time. If I than start working on something else and leave those windows open in the background, they will close themselves leaving only one of them open. I have tried going into task manager and restarting file exploiter and that didn't fix it. i am running Windows 10 pro. Does any one have any ideas on how to fix? 

Thank you!

Answer: 
**Possibility #1**

If the folder is deleted or moved explorer windows will close themselves. Are these folders being manipulated in anyway?

**Possibility #2**

The other possibility is explorer having too many files open at once. A good fix for this is to enable "Launch folder Windows in a separate Process". It's a little know feature of windows that allows the machine to separate file/folder access from the Explorer GUI process (been around since XP).

It can be found under Control Panel > File Explorer Options > "View" Tab > Launch folder Windows in a separate Process

**Possibility #3**

Alternatively, you can check to make sure that explorer hasn't become corrupted.

1. Launch an administrator commandline (Win + X) -> Press "A"
2. Click yes to accept the UAC prompt
3. Type this command "sfc /scannow" (without the quotes)

Windows will scan all of its core files and fix any problem it finds. I am an IT professional and explorer generally starts to behave after theses steps have been exhausted.
The simple fix is to set the Drive Map GPO to use the Action UPDATE.

To stop your mapped drives disappearing or automatically closing:

Launch Group Policy Managementnetwork-mapped-drives-closing-spontaneously-automatically
Find your drive mapping GPO, right click on it and select EDIT
Expand USER CONFIGURATION > PREFERENCES > WINDOWS SETTINGS > DRIVE MAPS
Double click on the drive map that is automatically closing
Change the ACTION drop down from REPLACE to UPDATE