Dp4 And Firewire Audio Failure, my motu 828 suddenly goes dead Options

[dixiechicken]

Have posted this in Interface forum as well. I dont know where this error belongs.

Today after working for 2 hours my 828 died on me again.
( has happened a couple of times before )

My small project "size machhiato" contains one activated miditrack for klicks.
( have five miditracks, NOT play-enabled )
5 audio tracks +1 Aux track for 2 effects applied to the vocals.
(3 mono and 2 stero tracks)

Laid down two vocal tracks it took an hour or so getting it right
( didnt save any takes or so - simply tried until i was satisfied )

Create the Aux track, read up in manual how to do the bussing.
1)
Assigned bus 1-2 steroo as Aux input
Assigned bus1 from vocl tr1 as output
Assigned bus2 from vocl tr2 as output

Everthing still working great, but all output from vocals going through Aux track this way.
( did have a few cpu spikes that could be heard at playback - nothing major )

Diving into manual again, reading up on how to use effects sends on my vocal tracks to send to the Aux track.
Assigned analog 1-2 stereo from vocl tr1 as output
Assigned analog 1-2 stereo from vocl tr2 as output

Assigned bus1 post fader to send1 vocal track1
Assigned bus2 post fader to send2 vocal track1

Worked fine - except I only got wet vocals on LEFT aux channel nothing in right channel.
( could mix dry & wet signals as I wanted )

Looked over my settings & routings again trying to figure out what i did wrong.

WHAM no output at my 828 1-2 stereo outs, no blinking lights. Did CMD+S to save my work.

Removed my 828 fw-cable with DP4 running but no sequence playing.
Put the cable back into my iMac FW-port. Nothing doing. After a short while the transport controls stopped working.
I cant pull down menus either. The (S)pinning (B)eachball (F)rom (H)ell does any number of encores short and long, whenever I try to issue a DP4 command.

Now I have to force quit DP4, reboot DP4 and maybe reboot my iMac as well. What gives???

Cheers: Dixiechicken