Windows 10 automatically manages your default printer and you might want to prevent Windows from managing your default printer if it keeps changing. Solution One- Turning Off the Let Windows Manage Default Printer Option

Default printer keeps reverting or switching back- Due to certain bugs in the system sometimes this issue may occur and you should be able to fix them by installing the latest updates.

Make sure to update your driver as this might be caused by your driver.

After a reboot or log off the default printer keeps changing randomly- According to some users, the default printer changes randomly after logging off or rebooting.Windows 7 default printer keeps changing to Adobe PDF- You just need to set your default printer if this problem happens on your PC and the issue should be resolved.Default printer keeps changing on Windows 7, 8.1 and 10- Even if you don't use Windows 10 this issue can appear on any version of Windows and you should be able to use most of the solutions provided below.If your default printer keeps changing on your PC on Windows 10 then it can be a minor issue but still an annoying one and here are some issues reported by the users while speaking of printer problems You can use one of the workarounds listed below if you want to prevent your default printer from changing on Windows 10 Default Printer Keeps Changing on Windows 10

Change default printer in windows 10