Strange error message during kernel execution: "No kernel updates in a while..."

Double check the programming guide to make sure you are not using a feature of OpenCL that is not currently supported. The compiler should flag cases such as these but it could be failing silently.

If you have multiple kernels in the hardware have you debugged down to the point where you know which kernel appears to be hanging? If not I would do that so that you can focus your debug efforts on that single kernel.

Last but not least, does your application code implement error checking and handling? If not I would add that since it could be a failure happening much earlier than the kernel launch causing this.