Just fired up an S3+ today which came with the antMiner_S320141126.bin and as prior posts indicate it would stop hashing (~47Gh) after a few hours. I thought it was bad hardware, but I had also upgraded 5 other S3 & S3+ today to the same firmware and they each began doing the same thing.
Uploaded antMiner_S320141024.bin and things are pretty normal.
Try upgrading to the latest antMiner_S320141126.bin firmware and then ssh in and execute this command.
cp /overlay/etc/config/cgminer /tmp/cgminer.tmp && cp /overlay/etc/config/network /tmp/network.tmp && rm -r /overlay/* && mkdir /overlay/etc && mkdir /overlay/etc/config && cp /tmp/cgminer.tmp /overlay/etc/config/cgminer && cp /tmp/network.tmp /overlay/etc/config/network && reboot
This should clear out most bad configs and preserve your network and cgminer configs.
You may also want to execute this to set your voltage
uci set cgminer.default.voltage=0725 && uci commit
and this to set your frequency.
uci set cgminer.default.freq=18:225:0882 && uci commit
These all seemed to fix any low hashing S3+ I had on the newest firmware.