Bluetooth connetion aborts

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Hi.
I've a problem with my "old" Diamond^^
When I connect a bluetooth headset to my Diamond and want to listen to my music it works.. but when I use the hardware-keys on my headset (play/pause, skip) it quits the bluetooth connection after 10 to 15 seconds and plays the music loud with the build in speaker. The keys still work but I can't get any music output from the headset. I have to reconnect it to use it again..
When I just use the software buttons (TF3D or WMP) to navigate through my music there is no problem neither.

With my Diamond2 there is no problem. I can listen, and skip and do whatever I want and it stays connected.

Anyone knows how to solve this issue?

[edit]
tryed different roms! Gen.Y, AZTOR, BsB's...

No one has any idea?

[edit] With my Bluetooth Car radio everything works fine. But it doesn't have any button to interact with the phone but the answer call button.. So why did my Stereo headset work with the Diamond1 for month and now acts like this?