That answer only shows that whoever wrote that, had no idea what he's talking about. The Bluetooth radio on the Flame turns off when the device is suspended and this is by desing; there is no compatibility issue with the headset/handsfree at play. Because after that the BT radio is off the headset/handsfree is disconnected and can no longer initiate calls no matter what brand you use; also once you receive a call the Flame will need quite a few seconds to reestablish the link, and by that time you may have missed the call.
No other device that I've had shows this behavior. The HTC Touch can be suspended but its BT radio remains active and connected to the headset/handsfree, the same happens on the Wizard and almost any other PocketPC Phone out there. Turning the BT radio off in suspend mode is a bad decission no matter how you look at it.
__________________
HTC Hero | HTC Touch HD | F-S Loox N560
|