Bluetooth connectivity problem

I have a BP5 BP monitor thats supposed to connect to iPhone in order to check the blood pressure (the BP reading is displayed only in the app).

In 9 of 10 instances, BP5 shows connected in list of Bluetooth devices in iOS Settings but does not show up in the app. I have to reset the BP monitor, as FAQ instruction, by pressing physical Start/Stop button of the BP machine.

I am trying to love this product/app because its BP readings are automatically entered in iOS Health app unlike Philips Healthcare Suite app.

I hope this connectivity issue is resolved soon and will reconsider the low rating I am giving.

mnlboi90006 about iHealth Myvitals (Legacy), v3.4.2