I have the same problem. At the end of every day, my step count is literally double what I have actually done. I've walked with my hand in my pocket so not to sway my arm too. Its a brand new 8 watch and 7 phone. I took them back to Samsung who just reset/calibrated them and said they are not 100% reliable for step counting. I understand that but not double ... its as if there are two counters going at the same time. I asked them th check my settings as it could be as simple as that but thst idea was dismissed.