I currently own 25 SP-30 and am having the same issue on all of them. They all seem to get to a certain speed of hashing and then cut out. They have been running for awhile now and haven't always had this problem. I have ruled out electricity issues and pretty much ruled out cooling issues as they run in a data center. Does anyone have an idea as to what the problem might be? I can send charts from the miners if that helps.
Thanks in advance for the help!
SP-30 has been out a while to have a issue on all of them makes me think it is something they all share, specifically with you. Have you seen temps as it is summer? Also maybe look if they look dirty as they have been out a while. Data center should not have dirty/temp issues but not all data center's are equal. Some use the term very loosely. I would looking at temps though.
If not temp I would talk with data center tech's. Do they have a team or at least one tech that can help you? If not might take a visit and see it in person.