Hi!
Im a new miner from Spain, Barcelona. Best regards for all!
I have two questions. I hope you can help me because i dont have any idea to find the solution of my problems.
I have one Antminer S3 B3 and one is working with 2 PCI Connectors @250Mhz and hashs at 500gh/s but in one hour and a half the hash decreases to 360-380 gh/s. How is it possible? The status of miner appears to be OK, without any "X" or "-"... Somebody knows whats happening?

if i reboot the S3 the hashing push up to 500GH/s but in one hour and half decrease too...

In the status no HW errors and nothing strange. Only i can saw is a Little decrease of temperature... 47-44 grades @500GH/s VS 46-40 @365-380 GH/s.
I observed that my miner works more stable with 2 PCIEX connectors tan 4. How is it posible??
And the second question is for the second S3 B3.
I tested 250Mhz, 237Mhz, 225 and default 218.75 but always i get a lot of HW errors. How can fix the HW errors?? The only speed that no cause HW errors is 212Mhz.
I think the temperature is not the problema because its working at 43-43 grades.
Two S3 antiminers are working with the last available firmware of Bitmaintech and are new. Arrived this week.
Can you help me?

PD:I hope you can excuse my English