Test it first to make sure that is the issue.
Basically, a DoS is when an attacker tries to make your PC unusable, usually by sending more traffic than what your PC can handle.
So hopefully you haven't ticked anyone off lately but in all seriousness, there is always a risk but this may be a low risk. DoS attacks are usually targeted attacks with the intention of bringing down a website, bank, etc.
If your a home user, the risk should be low. Personally, I would want to use this feature but if it is still broke your hands are kinda tied.
Unfortunately the unmanaged version doesn't allow you add exceptions like a managed version would. You either turn it off or turn it on.