Usually, TV shows tend to have their worst seasons either near the beginning (https://tvtropes.org/pmwiki/pmwiki.php/EarlyInstallmentWeirdness/LiveActionTV), as they're is still finding itself or towards the end as they're winding down (https://tvtropes.org/pmwiki/pmwiki.php/Main/LaterInstallmentWeirdness). Are there any examples of shows that actually had their worst seasons (https://tvtropes.org/pmwiki/pmwiki.php/SeasonalRot/LiveActionTV) in the middle of their runs. By middle, I would define it as by the fourth season and say two or three seasons before the final one.

Roseanne

Fresh Off The Boat