GPTs have become dumber, or is it just me?

Anyone else feel like GPTs have become dumber as time passes on? Whenever they try to analyze or run calculations they straight up fail and just say they cant do it. From simple algebra to complex subjects.

I upload PDFs in the conversation (not for context) and it just cant read it or reference it.

Multiple “connection” errors, network is fine. 200MB/s down and 10MB/S up.

Am I alone in this?
Screenshot 2023-11-20 at 11.14.39