Voice On The Phone And Humming In The Bathroom

I was talking with my mother on the phone and we have been talking for a bit and then all of a sudden there is dead air, nothing. I thought maybe we got disconnected, but when I looked the connection was still there. I said hello, you still there and I got a weird sounding voice say something, I could not understand. I called my mother back after hanging up the phone and she asked me what happened, she said it was all of a sudden nothing and then some weird sounds and then nothing. After I got off the phone the second time with my mother, I went upstairs to check on the kids and put clothes in the bathroom wash and while I was in the bathroom, I heard a little girl humming loud. I asked if it was any of them and they said no. Who knows what's gonna happen in the house again today and this is the kind of thing we go through daily unknowing what and when will happen.