Pretty happy with my used 2017 Outlander PHEV VRX that I got recently. It's done 8k miles.

I noticed a couple of annoyances (one I hope isn't a sign of something bad).

1. Interior/dash vibration, noticeable on any road not perfectly smooth.
2. Drivers seat has play and audibly creaks with any pressure from the outside shoulder or getting in and out.
3. Shudders on very low speeds accelerating or decelerating. Almost as if it's the transmission engaging or the regen breaks/breakpads somehow. The shudder is minor but frustrating in traffic with slow gradual acceleration or breaking.

Any thoughts on these issues? I have 10 months of new car warranty left from the previous owner.

Finally, would having aftermarket speakers installed affect my ability to have any of these addressed under warranty? I have the speakers and want to get them in but might not be able to get to the dealer for a while as it's out of town.