I do not have this issue. I did a thorough camera test the first 3 days and just tried shooting an indoor/low light shot right now as fast as I could after double tapping the home key. I don't get such results.
In the future, when you have an issue and want to talk about it or get help, please list what carrier you are on or what country you live in. Sometimes issues are found to be carrier dependant like the cell standby issues that are aggravated with wifi calling on T-Mobile.
Regardless that we all have an S6, there are hardware and tons of software/firmware differences between all the unlocked and carrier specific models. We can't help you or we can't rule out some issues if we are left in the dark as to what you are using.
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