Applications crash when past 50% ram

So as the title says, whenever my computer uses more than 50% ram, everything kind of glitches out and says that there is insufficient memory even though it's only using 8/16GB of ram that can be used. Windows 10 detects that there is 16gb so then why is it not using it all and crashes everything instead? This is kind of annoying when I have a bunch of applications opened as well as my 3d modeling software and it just kind of crashes because of missing memory.

Is there anyway I could fix this issue?