Siri suddenly stops working on MacBook Air?

I've recently gotten a new MacBook Air and so far the computer has been working great, but I've noticed that after about two hours of Siri working on my computer, the button in the menu bar stops working and holding down any of my key shortcuts doesn't work either. When I restart my computer Siri works again for another hour or two and then she stops responding again. Has anyone figured out a fix to this issue? I use Siri a lot in my day to day and it's annoying to have to keep restarting my computer. Thanks!