Alexa default service don't work after coming out of my custom alexa skill, it returns "Sorry I am having trouble, Please try after a little while" -

i have own skill "control room", before invoking skill can ask general questions alexa jokes, weather once invoke skill , come out of amazon.stopintent after default voice service not work. every time ask question, alexa returns "sorry having trouble, please try after little while"

what can wrong, how skill can affect this