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Roll back to the older driver.
Similar problem with latest driver and R9 280 card and 15.200.1046.0. My crashing was random but frequent - always in develop module, sometimes just switching to a different image or trying a preset. I was able to uncheck the GPU option in LR preferences.
I will be rolling back the driver and it's not the first time AMD has screwed up (nVidia is just as bad). Also, I was having less frequent hangs before this latest update.
New beta driver supposedly fixes the problem. I haven't tried it yet but I am using an older driver which doesn't crash.
-  Adobe® Lightroom may crash if GPU rendering is enabled