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FIX FOUND! I finally got my Thunderbolt to connect to my Z1 again. Not sure how long it will last, I will repost if anything changes. Settings>applications>manage applications>at the top "all">facebook for HTC sense>force stop-ok>clear data. Then settings>wireless & networks>bluetooth settings>long touch device>unpair. Go thru the pairing process all over again, I used pin "0000". I am not a facebook subscriber nor user, so the changes I made dont affect the app. Not sure what it will do for others. Post if it works for you.

My Thunderbolt, since new has been paired with my z1. Just recently (August) it will no longer connect....a pairing request message appears on the phone. I enter the pin, change the pin and it still will not connect. Any help is appreciated.

Your gps antenna has probably come loose and is pointing to the right. Just make sure it's firmly pointing forward with double stick tape or something like that.