So decided to upgrade my units to use the extranonce patch at westhash, step one was to upgrade you firmware, was using antminer_S320140826.bin moved to antminer_S320141126.bin, well had a great day trying to work out wtf happened to my units.
So glad this site is here, anyhow cut a long story short, tried most of the fix's suggested here to no avail and my unit were sleeping every 10-20 minutes in the end went back to original firmware, so far no issues. Great way to waste a Sunday afternoon.
Will look forward to the new firmware that works as it sure seemed better to browse with and keen to run some of those voltage frequency settings.