Icons turn black on device after going to sleep

On a galaxy note 2, after going to sleep and coming back on, all my gui images are black squares. I’m not able to reproduce it on my htc one. The textures are set to ‘gui’ and have no compression. Has anyone run into this before?

Has anyone else encountered this? It just happened on another note 2 - seems like it may be specific to this device

There have been multiple posts about similar issue
http://forum.unity3d.com/threads/111117-Android-Texture-problems-suspend-resume
http://forum.unity3d.com/threads/159199-Missing-textures-after-resume-with-Unity-4

I have indeed seen those, but it sounds like the textures on the 3d models are what is turning black. My problem is only ui elements turn black while 3d objects remain okay.