What operating system? What exact version of Lightroom? Did this just started happening? How much RAM do you have in your computer? How much free disk space does your computer have? Have you tried restarting your computer?
Operating system: Windows 10
Lightroom version: CC 2015.10.1
Started happening this week
140gb free space left
Restarted several times
Deleted Lightroom from computer & re-installed: problem stays
Please share the crash log error with us, how to find crash logs in Windows: Photoshop Elements Editor Help | How to Find Crash Logs on Windows
Also, you may try and turn off the GPU from the Lightroom preferences and check if that helps.
Open Lightroom > Edit menu > Preferences > Performance Tab > Uncheck the GPU > Restart Lightroom.