i did a clean install on ubuntu 12.10. Everything seemed fine at first including sound but after a while it stopped working. To get is back i have to restart it, sometimes even more than once.

Any idea on how to fix this?

sudo aplay -L



default

    Playback/recording through the PulseAudio sound server

sysdefault:CARD=PCH

    HDA Intel PCH, ALC665 Analog

    Default Audio Device

front:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    Front speakers

surround40:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    4.0 Surround output to Front and Rear speakers

surround41:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    4.1 Surround output to Front, Rear and Subwoofer speakers

surround50:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    5.0 Surround output to Front, Center and Rear speakers

surround51:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    5.1 Surround output to Front, Center, Rear and Subwoofer speakers

surround71:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

iec958:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Digital

    IEC958 (S/PDIF) Digital Audio Output

hdmi:CARD=PCH,DEV=0

    HDA Intel PCH, HDMI 0

    HDMI Audio Output

dmix:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    Direct sample mixing device

dmix:CARD=PCH,DEV=1

    HDA Intel PCH, ALC665 Digital

    Direct sample mixing device

dmix:CARD=PCH,DEV=3

    HDA Intel PCH, HDMI 0

    Direct sample mixing device

dsnoop:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    Direct sample snooping device

dsnoop:CARD=PCH,DEV=1

    HDA Intel PCH, ALC665 Digital

    Direct sample snooping device

dsnoop:CARD=PCH,DEV=3

    HDA Intel PCH, HDMI 0

    Direct sample snooping device

hw:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    Direct hardware device without any conversions

hw:CARD=PCH,DEV=1

    HDA Intel PCH, ALC665 Digital

    Direct hardware device without any conversions

hw:CARD=PCH,DEV=3

    HDA Intel PCH, HDMI 0

    Direct hardware device without any conversions

plughw:CARD=PCH,DEV=0

    HDA Intel PCH, ALC665 Analog

    Hardware device with all software conversions

plughw:CARD=PCH,DEV=1

    HDA Intel PCH, ALC665 Digital

    Hardware device with all software conversions

plughw:CARD=PCH,DEV=3

    HDA Intel PCH, HDMI 0

    Hardware device with all software conversions