There are two strong dips of -5 from peak to bottom that I can see, which would worry me a bit. However they do not go below 8db and you don't seem to notice any pauses/drops in your service so I would not worry.
If you start seeing big dibs that go below 7 or even 6db then, depending on your line, that can sometimes cause annoying pauses in your connection. Buying a better router or having your ISP limit the maximum profile/sync speed can usually help bring back some stability but so far you are in no danger.