This problem started 2-3 months ago. It doesn't matter who initiates call, after disconnect my phone plays the standard melody used to wake me up in the morning (Dreamland). I don't know how to turn it off, because no process is shown in task manager. Last time I did it by holding HOME key for 1 second, sometimes I just reboot the phone.
I wanna disable it since it's very annoying and causes downside effects to my work. Did anybody face such thing? How can I investigate the incident further?
As I thought (and following advice given down), when I changed alarm melody to another one, melody played after call was changed to the new melody. This time I stopped it using memory cleaner.
Phone model: Star X920 (HTC Butterfly)
Firmware: MIUI 4.4.25
Android: 4.2.1 JOP40D