Trying to mine with these on a pool that only accepts higher difficulty shares is an exercise in frustration. You pretty much have to mine on a pool that has lower difficulty stratums to choose from, or vardiff. Higher difficulty pools means your Gridseed miners won't get shares accepted as often and if any of the 10 you have connected to a controller takes too long, it'll reset and start all of them over.
Running 10 at 900 on the controller. Not having any problems with Waffelpool that has a diff set at 512. Typical restarts about once every hour or two. Still averaging about 3.4 MHs.