Chatgpt 4.0 error - "Unusual activity has been detected from your device. Try again later. "

what is “Unusual activity has been detected from your device. Try again later.” error? The chatgpt 4.0 freezes for a while and then you get this error. I am not issuing any crazy prompts, just simple English questions/dialog. Can anyone, share any insights?

Keeps happening here for multiple weeks now. It’s like, I’m posting my first message of the day on ChatGPT as paid user and I get rejection right away. OpenAI Support has been just unsupportive…

same, Unusual activity has been detected from your device. Try again later. (89c80d9aa9cb5b49-VIE) for two days

Same is going on in here.
I found some message in google saying this might be due to a VPN being active, I’m not using a VPN.