lremound :
Hello and welcome to the forums.
When the computer freezes, what do you typically have to do to recover?
Is the freezing producing any dump files, search the computer for *.dmp
You of course should double check the driver dates for the network adapters you are using (both wired and wireless) and make sure you have the most current drivers installed from the manufacturer's website.
Also since the wireless router / switch is a common denominator, you may want to contact the manufacturer's website and see if they have any recent firmware updates that may help.
You can also zip and upload your msinfo32 file and we can take a look for you to see if there is anything obvious causing the problem (just type in into the search or run box and hit enter)