Wireless connection is generally a bad idea for mining rigs. You need fast responses to reduce stale shares. Wireless can give you spiking latencies and could be the cause of why your rig is sometimes displayed as OFF.
I will change "Stability" to "Connection stability", which this actually refers to.
I've never had an issue with it, but I'm adding 8GB more ram to the rig in a few days so I think it will be more stable with regard to your site. Connection wise it's 100% stable. I just have everything else clocked down so low that the added traffic from your site may have pushed the wireless too far on the machine itself.
The only thing that would help is if you connect your rig to internet via cable, not wirelessly.
Well, like I said, I have never had an issue with it. I keep checking it when it goes offline on your site, and it never stops hashing or communicating with the pool it's attached to, and the pool my renter set up never changes, so as a renter they should have nothing to worry about, but I'll look at it. I'm running wireless N at 270mb speeds an on expensive router/AP running a stable dd-wrt flash, so I'm not sure how a wired 100mb connection would make things better. I game online, my step-son games online, and my connection quality never drops.
But again, I'll look at it and make 100% sure there's not an issue on my end. The last thing I want is for a renter to be unhappy with any service I provide.