I haven't had issues on the use of GPU on my new computer (purchased this summer). I do recall that with my old computer the ACR in PS CC 2015 crashed a couple of times and reported that the GPU use has been turned off due to a problem. However, it only happened a couple of times and those were some time ago (in 2015). I assume the problem was corrected somewhere (either in the driver, or in PS, or both).
I don't think the problem is with GPU computation per se, but simply the implementation. GPUs are becoming increasingly important in scientific computing.