Service has been unbelievably slow and dysfunctional over the past month

I’m paying for ChatGPT Plus. Over the past month, service has been ridiculously bad. When it works, it’s incredibly slow, taking a minute or two to start responding and then printing a few words every few seconds, taking several minutes to very, very slowly print a paragraph-length response. Responses are also often broken and disorganized. It seems like the output options ChatGPT can choose to use to respond are breaking down. I’ll ask it to write a small piece of code and it will respond with code half in a code block and half as regular text, with prompt syntax mixed in that clearly wasn’t supposed to be shown. Or at least a third of the time responses simply fail and I get no response at all or the first half-sentence of a truncated response. What’s going on?