Why does my iPhone 6 occasionally refuse to tether with my Macbook Air

Most days, my iPhone 6 tethers up with my Macbook Air just fine, and I use the personal hotspot successfully. But about once a week, the Air gives an error message that it cannot see the phone, and the phone makes a rapid series of alarm sounds. The blue hotspot bar at the top of the phone appears quickly as if it were to connect, then it doesn't. The phone shows the error message about whether to trust the Air. Restarts of both devices does not help. The only thing that helps is to keep the two connected, ignore the warning tones, and eventually the hotspot works. Weird
This is one of those problems that occurs intermittently - very frustrating because this kind of problem resists my ability to diagnose what is happening

An iPhone will not pair via Bluetooth to a computer (Mac or Windows) except for personal hotspot and then only if your cellular plan supports it. https://discussions.apple.com/docs/DOC-7722
If you are attempting to use Handoff/Continuity, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: http://support.apple.com/kb/TS5458

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