Hi, have the Body Cardio scales which are great. Recently they stopped working which I assumed was because they needed to be charged. I did this and have subsequently found that the charge is nit held for long, despite showing 100% charge. So I tried again, same thing happens. However when I leave the scales plugged into the charger, it works every time. I’ve have these since September 2020. Can you please advise as these are currently still under warranty. Cheers.