Oh, I use the Asus notebook F553M.

Have you tried running the Driver Manager?  You might be missing firmware for your WiFI.  I assume your referring to network connections?  As far as freezing, was it freezing prior to the new OS?  I'm kind of new to Deepin as well but its based on Debian and I've been using it for a Primary OS for about 10 years.  

I know from past experiences with new releases that random system freezes might also occur do to a missing graphic driver. Have you installed any graphic driver? Btw. are your system spec's similar to the ones described here: http://mln.com.au/product/?itemID=5861#specs? If so, then check this page on how to install a Nvidia driver: https://wiki.debian.org/NvidiaGraphicsDrivers.

And what brand/model wifi adaptor is on board?

No, it was not freezing prior to the new OS. .... I never had problems with freezes.

I checked which graphic driver is installed: Intel Corporation Atom Processor Z36xxx/Z37xxx

You could try a different Kernel.  The boot menu should list different Kernels and usually defaults to the lasted one.  I see there is a 4.2 and a 4.4 but unless you system installed the 4.4 Kernel updating it won't be in the list and you may need to install it manually.  I think I read someone updated there's to 4.4 and that solved the problems they were having.

If your list has an older Kernel in the list try booting that one first and see if runs any better.

Guys try this soution: http://linuxdaddy.com/blog/install-kernel-4-4-on-ubuntu/

What do you mean by Deepin's 'freezing'?  Is it the OS you are talking about, or one of its components - Nautilus for example.  Nautilus freezes all the time on my setup, usually after having transferred something over the network.  When that happens, I'm forced to kill Nautilus.  This didn't happen with Deepin 2012.  Also, are you talking about freezes that require reboots to fix, or just annoying 'stutters' in mouse movement?  If so, could be a wireless problem, at least I've experienced that in the past, just not with Deepin.

Hey there. Kats here. The kernel is not the problem. and yes, I have to reboot to fix the freeze. Is it possible, that something is wrong with the network? I visited my family this weekend and all worked pretty fine. No freezes or other problems. Now I am at home again, turned on my notebook and it freezes again. I used it for about 10 minutes (just searched something on the Internet) .... I really don't know what to do anymore.