A simple way to determine if the wireless link has anything to do with the problem would be to see if dropouts still occur when the computer’s wireless adapter is disabled in Windows.
To do that right-click the start icon at the lower left of the screen and then select "Device Manager" in the menu that appears. In Device Manager expand the listings under "Network Adapters," then select (highlight in blue) the entry corresponding to the wifi adapter, and click the button at the top which says "disable" when it is pointed to. That button will look like a black downward pointing arrow at that time; when clicked it will change to an upward pointing green arrow that would allow you to re-enable wifi at a later time.
An entry will probably also appear under "Network Adapters" for the Bluetooth wireless function you are apparently using for your keyboard and mouse, as well as an entry corresponding to the wired Ethernet port (most likely referred to by some other name). Those should not be selected when you click "disable," of course.
Good luck. Regards,
--Al