CHATGPT 4 PAID version is not working properly

I have been a PAID customer from the beginning. Lasting more than 40% of the time appeared “Our systems have detected unusual activity from your system. Please try again later.” But never say what unusual activity detected. How to fix it?

Unfortunately, we are unable to assist with any issue related to ChatGPT. Your best bet is to contact Open AI Support directly.

You can also check: ChatGPT says “Our systems have detected unusual activity from your system”? OpenAI Help Center.
Thanks.