My phone does this as well. I have a t-mobile GS3 and I am using GO Launcher, but ever since I got the update to 4.0.4 my screen flashes the dandilion pic from TW Launcher after any time I click on a notification or go to an app from the notifications bar (like a music app I have running that I want to switch back to, or a text message that opens up from the notifications bar)
Even if I am connecting to bluetooth and I just click on the bluetooth settings notification to pull up the available devices, the screen flashes just going to the settings. I don't think it's an issue with any apps I have, I think its a software issue or an issue with TW launcher in the background (because I use GO launcher).
Has anyone found a fix for this problem? my boyfriends phone does it as well, so I know it must be a problem with the devices or software.