How to resolve google cloud firestore read and write api error?

I have a android app connected to firestore database. I don't know why suddenly these two api's of firestore "google.firestore.v1.Firestore.Listen" AND " google.firestore.v1.Firestore.Write" are showing error and my production app is affected extreamly. It is showing that traffic is coming from unspecified api and it also says error by "unspecified" api but I could not figure out the problem. Please help me.