Intellisense not working anymore in C#


I’m having an issue with intellisense in C#. It’s been a week or two that the intellisense is not working anymore. The intellisense appears but does not provide the good methods.
Also, I used to type “for” keyword then “tab” so it creates the loop automatically. This does not work neither…

However, it is still working wit other languages.

Is there any option I could have disabled in C# to not have this anymore ?

Thanks in advance for your help