On the previous (pre-mod) board, I sometimes had to disconnect/reconnect the USB cable, or to cycle power to the board to make it start at 950. The present board, in particular after the firmware update has no such problems and consistently starts at 950. I assume that your board has the latest firmware, if not you should consider applying it.
I also found that my current board doesn't 'like' cgminer 3.9.0 and works consistently with the drillbit fork of 3.8.5. It works ok with 3.9.0 on a separate PC, but when connected to my main mining laptop (with a bunch of other USB miners and multiple instances of cgminer and bfgminer), it just wouldn't run on 3.9.0. The cgminer version is another thing that you may try.
Cheers
did a power cycle and usb reconnect even rebooted pc and reflashed latest firmware, it did run at 52:950 when i got it, the problem started when my router did its 24 restart. the first time cgminer just froze, second time the 8baord went nuts. now only 850 is the only thing that works and av 19,8 to 20.4GH/s as reported by CGwatcher. also added a fan blowing on the other side of the board, temp stable at 30C at room temp of 32C