WRT160n V3 and LAN network

Question

I own a WRT160n V3 router, and it's set up to be the host of a wired LAN setup. To detail the layout, one computer is directly connected to the router. A cable then feed from the router and into an ethernet port which leads to the back of the house. At the back, a D-Link DSS-5 switch connects to the port that feeds to the router at the front. From this switch, my brother connects his PC, along with another ethernet cable that leads back to my room. This cable then connects to yet another DSS-5 switch that I connect my PC and Xbox 360 to. As of late, there have been frequent disconnections  for my brother's PC, my own PC, and the Xbox 360, all of which occurring at the same exact time. It will lag out for a few seconds, then reconnect, but only after whatever we were doing online is terminated from signal loss. The {C at the front that is connected to the router has a stable connection, however. I've made sure the router has the latest firmware and even went so far to switch out ethernet cables for newer ones, but to no avail. Any help would be appreciated, because I've just about had it. 

Answer 1

If the computer connected directly to your linksys is behaving normally and not losing connection then your problem is likely downstream of the router.
Would it be possible to simulate your setup with short 6 foot ethernet cables between the switches in the same room instead of the current custom cable runs? Could your custom home cabling be the problem? Runs too long maybe? What happens if you swap the two switches, does the problem persist the same