I havew a little problem. I already pairing my Huawei band 9 with my Huawei smart phone but, when I would like to messauring my blood pressure the app says I have to pairing the device! I disconnect the smart watch then I pairing agian with the phone doing everything step by step BUT when I try to messaurinig my blood pressure its again says I have to pair with the device!!! and again and again and again... What can I do to fix this issue? Do you have any idea? Thank you