I have an on7 pro from last October 2016 .I use it heavily for normal usage .but not for gaming .anyway my device did not changed once .I also bought my device from Amazon.
1.using to many heavy aap at same time .so only keep open those aap you are using.
About a Samsung Galaxy on8 pro is 5 inch HD display and by a 1.2 GHz snapdragon 410quad core processor paired with afternoon 306 GPU and 2gb of ram and also a 16 fb internal storage .it completely best phone in range of 10000
I like this phone