Are you using a known good cable? cat 5 goes bad like anything else.
I'd check it if possible, or just get a known good replacement cable first. (cheapest solution)
Also check if updated drivers are available for the 311tx and the realtech)
The netgear may be having issues, but it has a lifetime warranty. You can get a replacement card relatively easily. (cheap-postage)
The other card (realtech) I have no idea about. I generally go Netgear or Intel nics (which are usually built into the board)
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