it looks like Fitbit is bricking old devices to force you to buy their new model. i had my charge 3 for 3 years, hadn't used that much but the screen suddenly started to show horizontal lines and starts freezing sometime. i was expecting it to last at least 5 years but nah, ain't gonna buy again after this. it's not reliable. rather gamble buying samsung galaxy watch. just add a bit of dollar and will get way better device. adios Fitbit.