Nissan X-Trail T32 stalls

[GT88]

Hi all,

Our auto 2016 Nissan X-Trail T32 with 50k km randomly stalls when in P or at the lights. The issue started a few months ago. Happens randomly. The mechanic connected to the computer and couldn't find any faults. Nissan said there are no known issues. It seems the idle isn't right and runs rough which probably causes low revs then a stall.

Had a general service the other month.
Air filter is clean.
I cleaned throttle body. Is it worth resetting the throttle/idle speed? These have electronic throttle bodies and I found the steps required to reset.
The coils appear to be good and working.
Spark plugs aren't due to be replaced for another 50k km so not sure if I should replace?
MAF sensor looks clean but I'll buy the MAF cleaner and spray that out.
I can't hear any vacuum leaks. Is there any tests or things I can do to get some certainty?
I put some Liqui Moly injector cleaner a few days ago. We use 91, not sure if 98 is worth trying?
I understand the fuel filter is a non replaceable part.
Has a new battery as the old recently died.

Any other tips?

Thanks.