I have full permission with super admin. server load is normal. Same issue for deleting redirection 1 threads. Its not server issue as i know.If you permission, there's nothing to prevent you from deleting redirection threads.
Depending on your server config -- and given you recent errors, it looks like your server is under high load -- and the amount of content involved, you may need to select fewer threads at time. (I'd definitely recommend you look into why it appears that your server is not performing well.)