I very recently got a new phone, I've been a big spotify user for a while and have spotify premium.

I installed it on my new phone and set the audio quality to high for my downloads. When playing songs while on the home screen it sounds very nice. However, if I open anything else, even just the app tray or settings, the audio quality drops dramatically. This also happens when I have my phone locked.

I never had this problem on my last phone so I'm not sure if its a problem with just this phone. Finding a solution would be lovely so I don't feel I'm wasting my money.

Phone make/model: Huawei Honor 4x
Android version: 4.2.2
EMUI version: 3.0