I dont care to debate with you on what "EXACTLY" means since it is not likely you will adjust your wording and agree that you used the word in error since the thread starter didnt mention disconnection as a problem. Remember, even IF disconnection is confirmed later, that still means LATER, not currently, hence not exactly.
Knowing the z1 or not doesnt really indicate how the thing works (fully), there are other factors involved. Such as: bluetooth compatibility, the bluetooth adapter itself, the phone, the provider in which the phone is used with since some providers "limit" at best the capabilities. Hence why I said I didnt know that phone as my phone is different.
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like people use to say in the ol dtv hack days, "my card works... except sometimes the channels freeze" guess what it doesnt work.. and it aint exactly if you catch the correlation.