Yeah, what GSDer said.
There have been some recent Play Store and Play Services updates too, I remember them coming through in the past few weeks (I recently installed B4, but I'm pretty sure it was before that).
There's a "Play Services Info" app, that checks to make sure all the components of the "Store Stack" are updated and all, and it gets pretty good ratings (4.4/38,8xx installs, I sort of use >=4.2 as my "bar", that and enough ratings, at least 100 or so, so this far exceeds that). Not saying I know anything about the app, or endorse it in any way, but the screen-shots seem to be showing the info you'd need here, or at least enough to make sure you're on "solid footing" to investigate further...
Edit: There's an app called "Play services Info" that has well "more info" about ALL the components in the Play Services stack, I just tried both. While both give me the last updated dates (7/31/17 on my 6P), the second one gives a LOT more detail, and gets a 4.6, also respectable.