MarkS5Mark
Lurker
Ok, I was having this problem with my Samsung Galaxy S5. On a slight drop such as placing it on a table or a light bang from normal use, the cell would restart. Very annoying. I did some testing and realized that the battery in its case moves about 0.5-1mm in gap between the top and bottom. Its just enough that on a bang the battery comes loose of the connectors for a slight second causing the restart. All I did to test if I was right was fold a small piece of paper up a few times, take out the battery, place the paper at the bottom (not copper connector side) and put the batter back in. Fold the remaining small paper on top of the batter and replace the case. I dropped the phone a little harder than normal and there was no reset. I also dropped it from different angles, no reset.