Galaxy S2 connects to my car by bluetooth but pops all the time

view story

http://forums.androidcentral.com – Hi All I have recently upgraded my S2 to the latest OS (4.1.2 - not cracked, manufacturer update). Previously my phone would connect to my car (Renault Clio with the tomtom built in, so I assume it's a tomtom system) and would work perfectly for hands free and would only pop up if I had a call etc, which is how it should function. Since doing the upgrade to 4.1.2, there has been a regular popping noise as soon as my phone connects by bluetooth I would say that it happens every 10-15 s. It's really frustrating as similar sounds have blown my home speakers before so god knows what it's doin (HowTos)