I've made a control right now. The problem is solved. SupportAssist is regularly connecting to the internet again.
I wanted to download an update from Support Assist but it says 'Unable to connect to the internet. Check your connection, and try again' even though i can use everything and my internet is fine. but when i try to fix it, it says something about updating proxy and selecting 'connect directly' from setting but that's already selected and it still doesn't work.
Dell SupportAssist cant connect to internet