I have developed a similar problem. After the 2.2 update, I have to continually go in with the phone and RECONNECT the phones BT to my cars BT. When I first turn on the car, they communicate, make a connection and my car shows (with its green light) that there is indeed a connection with the phone, then all of the sudden within seconds, the connection is NO MORE and I have to physically make the connection again. Just a little bit frustrating to say the least.
Hey, ellykay, by trying to reconnect it, do you mean "forgetting connection", then setting it up again, or do you mean just going into the phone settings the way they already are and trying to just tell the phone to reconnect? You may want to go into Bluetooth Settings (while bluetooth is turned on on the phone) and try UNPAIRING then setting it up all over again.