Sporadic vibration comes and goes, sounds like rumble strip.

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I get an almost random vibration happen for very very short blips, like half a second to maybe a second tops. It pretty much only happens in the 45-55 mph range as I'm acceleration (not hard). It distinctively sounds and feels as though I'm driving over a rumble strip. The car drives perfectly smoothly otherwise. Had a noisy bearing replaced so that wasn't it. Started noticing it after I replaced my pads and rotors though. I feel it mostly in my seat, not in the steering wheel. Any help is appreciated. Looking to see if the fix is small enough to keep the car. If it might be huge, I might just call it quits and trade it in. 2012 Mazda CX-9 AWD Thank you!

How long has your 2012 Mazda CX-9 had this problem?

1-2 weeks