Spikes when recording

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Hello,

I'm recording audio 24/7 with a delta 1010 sound card and have a
strange problem:

Every night at 2:30 I get spikes and some inaccurancy within some
seconds in a one hour length recording. I've upload a screenshot to
illustrate the problem:

http://img88.imageshack.us/img88/4562/spikesh.png

My .asoundrc

pcm.capt {
        type dsnoop
        ipc_key 223456
        slave {
                pcm "hw:0,0"
                rate 8000
                period_time 0
                period_size 320
                channels 12
                format S32_LE
        }
}

pcm.c1 {
     type plug
     ttable.0.0 1
     slave.pcm capt
}

pcm.c2 {
     type plug
     ttable.0.1 1
     slave.pcm capt
}

pcm.c3 {
     type plug
     ttable.0.2 1
     slave.pcm capt
}

pcm.c4 {
     type plug
     ttable.0.3 1
     slave.pcm capt
}

pcm.c5 {
     type plug
     ttable.0.4 1
     slave.pcm capt
}

pcm.c6 {
     type plug
     ttable.0.5 1
     slave.pcm capt
}

pcm.c7 {
     type plug
     ttable.0.6 1
     slave.pcm capt
}

pcm.c8 {
     type plug
     ttable.0.7 1
     slave.pcm capt
}

I'm recording with arecord -q -f cd -t wav -d 3600 -c 1 -D c1 out.wav.

 Any hints where the problem might be?

Kind Regards,
Peter Hoffmann

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