No problems here!
There are NO firmware issues causing disconnects!...in my GS5's at least.
I'm using cpuminer - works great!
Cheap USB hubs can be problematic but even they can run stably under the right circumstances.
Most that come in plastic enclosures are not shielded from EMI. This can cause issues.
Some are real crap. I'm using Inland 13 port and it seems pretty stable if I keep it away from the miners and power supply which emit a degree of EMI. Any electronic device that switches at high or low frequencies emits EMI (Electro-Magnetic-Interferance)

When my gridseeds were connected to ScrypGuild.com they were failing to find shares after being disconnected from their server - automatically - for what ever reason.
I've since moved to another pool and so far , no problems!

I see so many complaints and configuration issues coming up from cgminer and bfdminer yet, using cpuminer there are no such problems or issues! NONE! Why isn't everyone using cpuminer? I think, based on what I've seen and read, bdgminer should be called BFHminer (big fuggin headache) because it causes so many configuration and coding issues. Why bother with it then? I will say that cgminer seems to be a lot less buggy and most are having success with it. But I see few if any complaints about cpuminer from those who are using it. They seem to be simply hashing away with little to no issues.....me included!

No baby sitting here! Set and forget! Letter-rip and make you money! It's all about producing successful shares and converting it into money you can use! That's it.

Wolfey2014