I've got almost 60k miles on my 2018. Cold shifts are getting worse. And now when warm, its shuddering on upshifts and downshifts. My question for those that have dealt with this before: do I take it to dealer now, or wait until it grenades? I have an extended warranty, so *should* be covered. My concern is if I take it in now, the dealer might just say 'no issues found'. Thanks!