Minecraft launcher won't load.

Minecraft launcher won't load. 

When I run the launcher, the launcher just appears to be loading. There's nothing on the window, just gray. After a few hours nothing happens. I close the launcher and I can't reopen it unless I close it using the taskmanager. When I attempt to reopen the launcher it still doesn't load. Only way I know how to fix it is restarting my computer. 

I dont know how to replicate this issue as it happens randomly. 

This has also been happening for a few months now. I'm not sure if this is just an issue for me as I cant find any other issues like this online.