GS605v4 issues

I have a GS605 switch that I have used sucessfully for the past few years. It was previously hooked up in a play room with an XBox, Wii & Moxi (DVR) connected. We recently moved so I obviously disconnected everything and boxed up. When I hooked it back up - I kept getting errors on my DVR. Seemingly the connection would be there then it would go off. I used a different switch (GS105) and everything works fine. Now I have a need for another switch in a different part of the house so I decided to try to use this switch again (what's the old saying about the definition of insanity...).

Switches rarely go bad right?

Same problem - seems like I have a connection at one minute then it's gone or I have a connection at one port but not the other. The individual components work fine when directly connected so I'm pretty sure the cableing isn't an issue (I ran & terminated my own Cat 6 cables). At our old house it was all Cat 5 - but that wouldn't make a difference would it?

Considering the problem went away when I used a different switch (first location) and each component works when directly connected make me think it's a bad switch - any other issues anyone can think of? The only thing I didn't try was moving the GS105 to this location but the GS105 solved the issue in the originall location so I assume it would here as well almost confirming that it's a switch issue.

A little bit about my network - Motorola Surfboard cable modem, Netgear WNDR3400 wireless router, Cat 6 cables running to switch Cat 5 patch cables to individual components (note: switched patch cable  to make sure I didn't have a bad cable - I didn't) - less than 50' run from router to switch, router sits right next to modem. Switches aren't daisy chained.

Any ideas or just chalk it up as a bad switch?