paid subscription stays active
 

This is in regards to paid subscription, for some reason, it doesn't update. For example, when a subscriber hits the expiration date, it doesn't take him / her off, and the subscription stays active.

I have had this problem too

are your cron jobs set properly?

Scheduled Tasks >> "Subscriptions"

Yes it randomly does not remove some subscriptions, It worked fine until 4.1.2
I have thousands of subscriptions and it is a real pain to find them as you cannot search in user.php based on paid subscriptions.