Whoa, a technical difficulty such as this is quite rare. This most likely affected your verbal performance quite a bit. For the amount of money you pay, things should be flawless on their end - and it wasn't. I don't know your chances, but see if you can schedule a free retake. A computer shutdown is simply unnaceptable.
With that said, there probably is still room for improvement on verbal (your quant can't go much higher). If you decide to retake, focus more on verbal, but keep sharp in math with the
GMATClub tests. This should put you over the 700 mark (assuming no more technical difficulties).
But is it worth your time? I'm not entirely sure. You performance is solid and others have been accepted with lower GMAT scores. Plus, you don't seem to be that enthusiastic about doing this again. Without motivation and 100 percent concentration, a retake becomes risky. There's also the issue of the application process and essays; these require a great deal of time and effort. Any sacrifice on the essays is a sacrifice of the acceptance letter.
In short, you are capable of a higher score. But if your heart isn't fully into it, then a retake becomes somewhat risky. And you have to start on those essays soon.
Take a week or so off. If you want to do a retake, then do it within four weeks and go hardcore on verbal.