Bought my S7edge duos exynos 6 months after launch. It worked beautifully for almost 4 to 5 years. I even rooted it multiple times and installed custom roms etc.
Well it suddenly died on me a few months back; completely unresponsive. Showed it to a tech today and 1st he said that processor failure is common in these phones but he'd check whether the battery maybe at fault. Turned out to be the processor; ended up getting a snapdragon replacement and its up and running now.