It's the older auto box in mine...
Solenoids can be problematic but as long as the fluid is changed when it should be then it should be ok. Mine has just started to get a bit funny if it's hot and I'm sat in traffic, changes a bit late etc. but as soon as it cools its fine again.

I'd advise the OP to check for an ATF change in the history if it's an auto

I'm no expert by I've listened to my mate waffle on enough