External hdd and wifi problem

I ve got a macbook pro 13' with retina (256 ssd and 8gb ram ) and when i connect an external hdd ( through usb ) wifi lost signal ( all the time )
When i disconnect it everything is fine !  The external hdd is usb 3 !!
Is that a known problem ?

Hello, isnoulis. 
Thank you for visiting Apple Support Communities.
Here are a couple troubleshooting steps that I would recommend.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Cheers,
Jason H..

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