So I'll push back and state that infotainment systems aren't embedded systems, more akin to a phone OS with the wide array of UX applications.
But yeah these infotainment systems are often left running on newer cars for connectivity and other features and just like any other OS, leaving it up and running is going to slow and get unstable over time for to memory usage.
Like I said, mostly not a big deal unless you're a Tesla and critical information is there and you didn't regression test properly.