N.O.
Totally normal. It will pass. My daughter was around 8 months when she did the same thing. I thought something happened to her that I didn't know about and it freaked me out. I got in the tub a couple times with her and went from playing quietly with toy to being silly and it she calmed. It passed in a week or so and never returned. My son is 12 months now and still hasn't done this - maybe because he's in the tub with my daughter all the time?