Actually I purchased exynos version in 15 months before in a good condition (2nd hand only)....after 4months one fine day switched off automatically...couldn't on...in a samsung service centre they simply told me that ' have to replace the main board...
do the followingscreen resolution should be hd+refresh rate should be in standardput dark modebattery saver onclose and clear all the appsif u can use in ac roomif it gets heat keep the phone on the wet clothif it gets heat avoid to use phoneotherwis...
