Hi, I have HH7 almost 1.5yrs old. From last 20 days it started to suddenly turn off when battery reaches 30% or 40%. More over charging time has become variable, sometimes it takes 1 hours to charge 100% and sometime 4-5 hours. Battery-health seems to be Good in "About" section of settings. I have calibrated the battery once or twice but nothing positive. Overall usage time after 100% charge is about 5-6 hours of moderate use. What should I do? Please help me with your expert and genuine guidance. Thank u.