Musics, google voice search and volumes keep popping up

[Android Central Question]

Hello, i wish you could help me with my problems that im currently facing. So, my musics from imusic (im not an apple user , im a Vivo user and its an fixed app) keeps on turning on and off and then google voice search keeps on popping and the volumes keep went high and low by itself. To tell you the truth it creeps me out. I dont if something wrong with my phone or what. But i've done a lot of things that could probably fix this problem. Ive downloaded a lot of anti virus apps like avg anti virus (in case its because of virus) but it doesnt solve my problems. Please help me...