Chatgpt 4 supposed to generate images via Dall-e 3, anyhow forcing dall-e 2 model

I am a plus member, I am generating images via chat prompt (model chatgpt 4) As a paid member should I have the ability to request images in dall-e 3, however i am mostly forced to use dall-e 2 during this week, model refuses to use dall-e 3. Any ideas why this happens a lot ?