For the past two days, ChatGPT 4 has not been working, although the 3.5 model is functioning properly. I have a Plus subscription. I contacted the support team yesterday regarding this issue but received nothing beyond the usual recommendations to check my browser, VPN, cookies, etc. I've tried accessing my account on both Chrome and Edge, cleared all cookies, and attempted to connect in Incognito mode. Additionally, I've checked the mobile version of your official ChartGPT app on iPhone. I'm not using any VPN and am currently located in Europe. I haven't made any changes to the Firewall settings in Windows 11. According to your status website, everything seems fine with all systems operational. However, I'm unable to use ChatGPT 4 as I keep receiving the message "Hmm...something seems to have gone wrong." Upon inspecting the developer console in Chrome, I noticed the following error: POST https://chat.openai.com/backend-api/conversation 500 (Internal Server Error). I've also attempted to connect from various internet providers, including home, office, and mobile data, but unfortunately, without success.