Hello, I would like to ask I have a charging problem with the Acer liquid Z520. The battery level fluctuates, for example, it charges to about 45% and then drops again, for example, to 15%, while the mobile phone is still connected to the charger. The battery is about 3 months old and the charging connector was changed 2 months ago. The mobile phone has been angry like this for 3 days. I really don't know what to do, I tried everything, remove the battery, restart, but unfortunately nothing works. Thank you in advance for your advice.