I'm also having the issue with the S3 hashrate dropping off. It generally starts around 435Gh but drops to around 390-400GHs. I'm at work now and I'm looking at my S3 on Slush's pool and I'm currently showing -
Total average hash rate in last 60 minutes: 381070 Mhash/s

Has anyone found a solution to this or had word from BitMain?
Some units do and some don't, try a lower clock such a 212.5 as others have identified. I have one that runs steady at 218.5 and another that does not like the stock clock but runs fine at 212.5, and is reliable at that speed.
I'm also having the issue with the S3 hashrate dropping off. It generally starts around 435Gh but drops to around 390-400GHs. I'm at work now and I'm looking at my S3 on Slush's pool and I'm currently showing -
Total average hash rate in last 60 minutes: 381070 Mhash/s

Has anyone found a solution to this or had word from BitMain?
Some units do and some don't, try a lower clock such a 212.5 as others have identified. I have one that runs steady at 218.5 and another that does not like the stock clock but runs fine at 212.5, and is reliable at that speed.
this is the way to go. my 2 units run at 212.5 very well
look at my charts solid at 430gh and 212.5 Note that dip was a T-storms caused blackout. gear auto -booted back to normal and 430gh
http://imagize[Suspicious link removed]ageshack.us/v2/1280x1024q90/745/dtIArs.png