I upgraded to an iPhone 8 six weeks ago and have been going back and forth with Apple for 5 1/2 weeks over this issue. The Bluetooth repeatedly disconnects and reconnects in my 2012 Mazda 3, when the iPhone 5S running iOS 11 worked perfectly before upgrading to the iPhone 8. I’ve had my car checked by the mechanics at the dealership and the Bluetooth in the car is working perfectly (Apple wouldn’t investigate the problem until I’d been to the dealer). I’ve done all the un-pairing and re-pairing, rebooting the phone, doing a full reset of the phone etc. I’ve replicated the problem and sent logs from my phone to Apple and they’ve run diagnostics on my phone remotely and say it’s working properly. I’ve been to an Apple authorized repairer who were unable to replicate the problem on the Bluetooth devices they had in the store and will be providing a report for Apple tomorrow, saying the Bluetooth problem is intermittent and they haven’t been able to reproduce it in the half hour or so that they had the phone.
I’m waiting on a call back from Apple tomorrow but it looks like my only option from here may be to agree to send the phone to Apple interstate and let them run testing on the phone, which means being without a phone for the time it takes (I don’t have a landline and even if I got my old iPhone 5S back from the person I gave it to, apparently the iPhone 8 SIM card doesn’t fit it) and in all likelihood, them saying there’s no problem. I didn’t purchase the phone outright from Apple and got it as part of a contract with a phone carrier, so can’t return the phone as they will only take it back if I can’t get phone call or internet coverage in my area. According to the Australian Consumer and Competition Commision, that means I’d have to write a letter of demand to the phone carrier saying why the phone is unacceptable and what resolution I’m looking for, then when they refuse to accept a return, will have to escalate it to the telecommunications ombudsman. This process is likely to take a few months if I decide to do it. I’m so ****** off and wish I’d just stuck with the iPhone 5S.