Seasonal Rot

Seasonal Rot is a term for the tendency of television series that run for several seasons to become stale and formulaic or become denser and wackier. The accumulated changes or formulaic episodes 'rot' the show from its original 'fresh' premise and ideas.
TV Tropes defines Seasonal Rot as
An installment in any long running series that is widely held to be of notably poorer quality than the other installments. Often tied to the dislike of a specific arc, but can also befall episodic shows. In some cases, a new director takes over and pulls the series in a different direction; this can give the impression of Seasonal Rot to those who liked the old way, but may also bring in new viewers who prefer it like this (in other words, a change in tastes or audience).
Sooner or later, if a show runs long enough, Seasonal Rot always sets in. Sometimes it's a temporary dip from which the series recovers (perhaps by bringing in new writers, changing the premise, or in severe cases simply ignoring the events of the rotted season). Other times, it proves to be irreversible and grows worse with each new season, at which point the series has Jumped The Shark.
South Park is widely agreed to have undergone seasonal rot, having undergone numerous changes throughout its long run of twenty-five seasons, but unlike many series, the fans are in deep disagreement as to when it peaked and when rot set in, with almost every new season at some point being accused as the season that the rot either set in or peaked. It is also a common refrain for fans to cite the most recent seasons as being "too political" even though South Park has satirized political issues since the second season and more outright since the eighth season, which is generally popular, especially among younger fans.
One of the few widely agreed inflection points is the twenty-third season and the Tegridy Farms storyline., which relied on a rather mean-spirited humor in which Randy focuses on his marijuana business and is willing to commit murder to make money and keep it afloat, with Stan Marsh and other characters exhibiting boredom and misery to which Randy ignores. It has received a mixed to negative response from fans, many of whom see is as an example of the show's seasonal rot setting in.
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