windows 7 alt tabbing every 10/15 min

hello
my win 7 is alt tabbing every 10/15 min... the problem accours when i restart Windows then after 1/2 hours it stops...
when iam in a game it minimizes to the desktop... if iam in Windows with a Window open its like clicking with the mouse in the desktop background and then click the Window again... it happens very fast in less than a second...
the only way to make it stop is to disconnect the internet cable, but if i connect the internet cable the alt tabbing comes backup again....
ive tried this solutions none of it worked:
safe mode/
run malwarebytes
cccleaner
combofix
unistall / install antivurs (AVG ver 2015.0.5751) - run full scan / rootkit /etc...
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i cant track the problem in task manager nothing shows up in application/processes or services ... and ive been killing useless services
ive made a custom view event viewer with the option (Interactive Services detection)
but i cant track whats causing the alt tabbing.... i cant fin an option in Windows that detects this
like ive said above the only way i found to stop it is to unplug the internet cable....
anyone has a clue of how to find out whats causing the alt tabbing....

thanks
ive just uncheck that option in the Ethernet
now ill have to wait to see if it worked... when I think ive got rid of this it comes back on in the next day out of out of nowhere...
if I could track down the process it would be easier to catch the animal

It didn't worked
it keeps going to the desktop every 10/15 min after I restart the computer

Is there no way to find out what this is ?
witch thing is minimizing other application every 10 min