Why sounds disappear sometimes when i plug or unplug external speakers ?

Sometimes when i plug or unplug my external speakers, sound disappear compelety.
Rebooting fix problem, but i didn't have this problem before i updatet my system software to Lion.
Is there anyway to fix this problem.

See Troubleshooting iPhone Hardware Here
http://www.apple.com/support/iphone/basics/

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    HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
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    HP Photosmart 7520 AIO
    ++++++++++++++++++
    **Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
    Intelligence is God given; Wisdom is the sum of our mistakes!
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