there's fingerprint issue with my xzs . When i locked the phone and unlock it with my fingerprint with no apps running in background , i only gt 1 time sucessful out of 10 times . However , when i open some apps like fb , whatsapp and etc and lock it by pressing power button , then unlock it with fingerprint again , success rate is almost 100% , why ya ? When i press the power button , i was asked to enter the pin , why ya ?Any setting problem ? or hardware faulty ?

same .... should i send it for warranty ?