Huawei P30 Pro Volume Decreases on its own after few seconds.

Im having problem in my Huawei p30 pro after an update and they haven't fixed. Also they are staying its technical problem. The volume is loud in max volume at first for few seconds and it decrease on its own, even though the volume is max. It happens while playing music, RUclips, gaming and also in calls. Only the loud speakers. Rest is fine.