It appears to be an issue with nicehash control -- I have this issue with any CCminer 1.1, 1.2, and the latest NVMiner build.
Behavior only present on auto-switching.
The behavior is present across multiple rigs (780 rigs, 750ti rigs). Running the miner with a built in pause command does not change the behavior either.
Again, it still generates shares, but they are either not submitted to my deposit address, or it is running in benchmark mode.
I tried to diagnose a bit what might be happening here, but with no luck. NiceHash Control only starts a process and later kills it. There seem to be no other IPC, no OpenCl/Gl calls, or such things.
The only thing I can think of is that maybe ccminer leaves the GPU in a bad state when it is being killed. Do you start ccminer directly from NiceHash Control or do you use a batch file? How current are your GPU's drivers? Have you tried NiceHash Control 1.1? (That version uses a different way to kill the miner.)
Also, have a look at ccminer's window. Any messages there? (Both at startup and while it is running.) Does it go "yay!!!"? Does it say "benchmark mode"?
If that doesn't help, please post your nicehashcontrol.conf and batch files (remove your passwords!!! and user names).