Fonts you use disappearing
First, I have done everything the Adobe support team told me and it didn't fix the problem. I have also reset Illustrator multiple times and re-install it and it didn't fix the problem. I also have no control an any Issues that I'm having so I can't tell you what I do that causes the problem it happens randomly like all Issues that I have shared and haven't shared yet.
I have attached a screenshot of the Issue that makes it clear whats happen with random fonts (typekit included).
Finally I can say that this issue can't be related to my computer or system cause I discoverd this problem also at the agency where I recently start working. I also was using helvetica neue but also other fonts had this issue. And this time also in InDesign.
Another issue related to this cause it happens at the same time also: If I save a document, illustrator will jump back 1-3 steps and in order to get to my latest version I need to close illustrator completley and restart it. (everytime) Also when working with typography the bounding box start to disappear randomly and I need to turn it on again and again and than settings like size/leading/letter spacing start not working or if I change the values Illustrator also jumps back 1-3 version and there is no way back to the latest version forward.
Also the Font name disappears too. — I already had a in depth conversation about this and other issues via mail but no solution yet.