This may happen with a certain type of ad format, called bumper ads (since they’re only 6 seconds long). You can send feedback on your viewing experience via the send feedback tool: http://yt.be/help/a4gp . Hope this clarifies.
@TeamYouTube what’s up with ads right now? Was watching @PhillyD & there were back to back ads before the video started, another set of double ads at 13min, & another double at the end (18min). Another video had a double midroll & then ANOTHER ad 2min later! Is this normal now?
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