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Have you tried connecting to any other Bluetooth devices apart from the HBS730 headsets?
If you are having the same problem with other Bluetooth devices then the phone may have a hardware fault.
If the problem is only when you use the HBS730 headsets, then they may not be compatible with the latest Bluetooth updates on your phone.
No, there are no specific notices about any recent updates causing this problem, but updates do cause unknown problems from time to time.
It is odd that another headset would not pair either - did it pair ok previously? That would be the real test.
Bluetooth software is constantly changing and being updated, and it is a real battle to keep devices communicating smoothly over it.
The only other possibility is perhaps there is wireless interference from a nearby device that is causing the headset not to pair correctly with the phones.
No, there is no specific flaw that anyone has reported, so it is more likely to be a fault with the hardware itself, or possibly a flaw with the combination that you are using, and no-one else has reported yet.