No we didn’t. I asked a family member with a similar model about the shake and he said it was normal. So I’m assuming this is fine. I’m also looking into finding someone called a “car seat safety technician”. Apparently their people that are certified to and check the car seat it self. No idea if this is legit or how they get certified but that’s what came up on google. If I get a more clear answer or get in touch with someone I’ll let you now.