Bad driver I should think. Go to Lenovo's site and download the original audio driver for your machine. Alternatively open device manager and expand 'Sound Video and game controllers' , right click Realtek (if that is the driver) should show something like High Definition Audio (or whatever audio driver your machine uses) select 'update driver'. Select 'browse my computer for driver software' then 'let me pick from a list of available drivers on my computer'. In the properties window see which driver is in use. Usually highlighted somehow (possibly grey or blue). Either try to reinstall the highlighted driver (original) or try installing another one if you have a list. Reboot the computer. Repeat if you have more than two listed but only if the problem reoccurs after installing from list.
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