OK. Last Night miner 06 alpha stopped again without warning. I have paste the last words of logfile. Maybe it helps to find the problem.
GPU are running on stocks clocks with very low undervolting (-12mV)
I will try to start again without undervolting

How can find out wich card is device 2 ?

New target received: 0010077c5440fca4
New job received: 331
New job received: 332
Submitting share
Share accepted
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Average speed (300s): 29.2 sol/s | 28.7 sol/s | 29.0 sol/s | 29.0 sol/s | 28.9 sol/s Total: 144.8 sol/s
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Average speed (30s): 29.0 sol/s | 27.7 sol/s | 28.4 sol/s | 29.4 sol/s | 28.7 sol/s Total: 143.1 sol/s
Submitting share
Share accepted
Submitting share
Share accepted
Average speed (30s): 28.2 sol/s | 29.1 sol/s | 28.6 sol/s | 28.9 sol/s | 28.8 sol/s Total: 143.6 sol/s
Submitting share
Share accepted
New job received: 333
Average speed (30s): 29.4 sol/s | 28.5 sol/s | 29.0 sol/s | 30.5 sol/s | 28.0 sol/s Total: 145.4 sol/s
Submitting share
Share accepted
Average speed (30s): 28.4 sol/s | 28.6 sol/s | 28.1 sol/s | 28.5 sol/s | 28.0 sol/s Total: 141.5 sol/s
New job received: 334
New job received: 335
Average speed (30s): 27.7 sol/s | 29.2 sol/s | 28.5 sol/s | 29.0 sol/s | 28.6 sol/s Total: 142.9 sol/s
Submitting share
Share accepted
Submitting share
Share accepted
Submitting share
Share accepted
Average speed (30s): 29.2 sol/s | 27.9 sol/s | 28.4 sol/s | 29.8 sol/s | 26.6 sol/s Total: 141.9 sol/s
Submitting share
Share accepted
New target received: 00197e7f030cba48
New job received: 336
Submitting share
Share accepted
Submitting share
Share accepted
Average speed (30s): 29.3 sol/s | 28.7 sol/s | 18.4 sol/s | 28.9 sol/s | 31.0 sol/s Total: 136.1 sol/s
Error: lolMiner detected that device 2 is stucked
Shutting down lolMiner