In my dropout.log after 5 minutes i can read this:

Limiter Indicator
Total Unmasked Dropouts: 0
Total Masked Dropouts: 0
Callback Dropout Indicator
Total Unmasked Dropouts: 39
Total Masked Dropouts: 0
USB Dropout Indicator
Total Unmasked Dropouts: 0
Total Masked Dropouts: 0
MIDI Dropout Indicator
Total Unmasked Dropouts: 0
Total Masked Dropouts: 0

Is this a Hard- or Softwareproblem?