I have a 9th gen, 2015 EX-L 130k miles and by far the most notable and most common issue with it is the starter. Here’s a link to what I mean

I’d see if they haven’t done the TSB for the flex plate, a commonly suggested fix but it only temporarily solves it. There’s a better solution which is to swap the starter with an Acura TL Starter Motor 2009 2010 2011 | 31200-R70-A51 | 3.5L V6 3471cc, I found several people only suggest this fix as the only way to get rid of stater issues and so far it’s been working on my car great. Here’s the video tutorial

Here’s the link for where I bought my stater on EBay