Booking through series

If you read series, do you ever find a series “jumping the shark?” How do you feel about that?
And, do you keep reading anyway?

I am not much of a series reader. I prefer stand alone novels. I did read the Harry Potter series and also read the first two novels of the Millennium trilogy. Looking forward to read the third one too.

I have read all the Tintin albums in the proper order. And none was disappointing.  I simply stop reading any novel, which doesn't hold my interest, be it of a series or otherwise!