Hashing has been stuck at 87.51.  The link to the API shows the current data, correct machine showing at 0.  I've tried:
1.  Restarting phone...still showed hash at 87.51.
2.  Changing API...still showed hash at 87.51.
3.  Restart phone again, still showed has at 87.51.
4.  Delete CKPool app from phone, restart phone.
5.  Download app from store, put in username and api key.  Now it shows 0 hash and no workers.