I have had my fitbit flex sleep mode flex for a little over a week and it's acting strange. Going into sleep mode even know I'm moving. I tried to reset it and nothing happens. Then it did work for about 30 mins and now it's doing this thing were it flashed my 4 light over and over and won't stop. I dot even double tap it and it's doing this. Very unhappy because it was a gift and I don't have a receipt to return it.