I'm seeing the same issues, drop offs in reported hashrate, some devices not seen when started, some going dead after a few minutes. Review my post above for a temp solution until BFG 4.0 comes out. (sorry Linux only)
Have you tried BFGMiner on Linux? Your above post indicated that you downloaded a Windows build, had issues, switched to a different app and Linux and had success. It may have been the switch to Linux, not the switch in apps.
I am currently the one working on the GridSeed support. While BTC and Dual Mode support are still planned, I'm not seeing any issues like you have reported. On the other hand I am not testing with 10 and 20 and 40 devices, only a couple and both from the same reseller.
Basically there is no "until 4.0 comes out" as there is nothing yet planned to address these issues. I've got a couple of these running for days at a time on Windows with no drops in hashrate, no issues discovering them, etc.
And I thank you for your support, appreciate your many contributions, including this new 5-chip device.
I have tried both pre-compiled windows and Linux, compiled by me from your branch. It will work fine with a few, but not with 20+, it's all over the place, and fails in ways I have mentioned. I must have misread a post about a 4.0 version coming out, if that is not the case I stand corrected.
I always prefer Linux over Windows for mining, and only use a Windows miner as the last resort until I can get something figured out or working under Linux. I am not a programmer, but I will compile and tinker with any and all hints I can find to get things working. To me that is half the fun. What I do know is that I have a working solution now, maybe as a programmer and understanding code better you can see what he is doing under the hood and incorporate it into your branch as well? (
https://github.com/dtbartle) Whatever is fair as open source goes.