Why is there suppression talk of quality degradation?

Reposting because they auto modded and tried to suppress my post two times now
The past 3-4 updates have seen a noticeable difference in quality. Same prompts same exact words generate widely different approaches which have developed into looping and burning through credits.

I ask it to add a line to compare two strings, and it instead goes and modifies the files to just make the strings match.

I use cursor rules
I program for my job I use this for my side projects So i’m not asking it to solve P=NP, just basic things.
who can i talk to about going back to month to month