On Wed, Feb 17, 2016 at 9:51 AM, Felix Deichmann <m4j0rd...@gmail.com> wrote: > 2016-02-16 23:32 GMT+01:00 Jose Luis Rodriguez Garcia <joseyl...@gmail.com>: >> Both disconnect at same time, and usually connect at few seconds at >> same time (when they don't connect I have to reboot the pc). > > I had this with a USB frame grabber under Windows with a new PC, you > could hear the disconnect and connect sounds each time (and recordings > were always borked). Finally hunted it down to the exact moment when a > fridge (!) with its compressor nearby turned on and off. USB together > with modern PSUs seems very susceptible, google it. > This is heavily dependent on your computer's PSU, the case, good > grounding of the mainboard, and if it's related to a mains > interference like above, there are special filters for such equipment > (maybe the already present filter inside is broken). > Other expensive solutions, if nothing else helps, are an online UPS > (Uninterruptible Power Supply) for your PC or a different PSU > reputedly...
Thank you Felix I will try as you said. I will use the the power supply of a laptop, and I will test it for serveral days/weeks. The problem is very random. As you can suppose. Neither my pc ( a nettop) or my lapto have ground.