Turn on by itself with the lid closed

I have a Lenovo v100 0763 laptop and I have this problem:
When I close my laptop lid, it goes to standby mode (I don't activate the hibernation mode) but it only lasts for 20-30 minutes when I can hear the (humming) sound of the machine starting again even with the lid closed.
When I open the lid, it shows the login page directly like it has always been on (left standby with the lid on)
I had this problem around a year ago, and then I brought the laptop to a service (along with many other faulties - like the screen) and they fixed them (it was under guarantee back then) but now the problem suddenly came back around a week ago and this applies for both condition when it's plugged onto electricity or when it's under battery power only.
My setting for the power is Lenovo Standard 
                                                    Power                      Battery
Close the screen:                       after 25 mins             after 5 mins
Shutdown the harddisk:              after 30 mins            after 5 mins
System standby                          after 25 mins            after 5 mins
Does anybody know why my laptop behaves like this? Because sometimes I left my instant messenger on (It automatically went off when I closed the lid) but it went right online again when the laptop was turned on by itself.
Thanks in advance
Eva

Sorry, but I cannot find it the one that you meant.
Is it the boot from network setup? Because there's no such thing as Power Management Setup in the boot menu. It's just bunch of options on from where to boot and since my laptop is turned on from standby by itself, does it have anything to do with booting?

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