My iphone keeps calling my mom by itself immediately after I finish a call with someone else... why?

Question

Just as the question states, every time I hang up the phone with someone, it IMMEDIATELY dials my mom, but it doesn't show that there is a call in place or show that it is dialing. It has NO indication that my phone is calling someone. It just does it by itself, no sign  of the call. I could be typing an email on my phone without any hint that a phone call is taking place, but my mom will then call me back and say she could hear me on the other line, and that she was talking back yet I couldn't hear her at all.
The weirder part is that this ONLY happens with my mom's phone number and my phone. And it's always MY phone calling her, never the other way around. Even if I was talking to her on her phone and hung up, it will STILL call her back right afterwards.
I have an iphone 4S, up-to-date with iOS 7.1
I recently had to wipe and reinstall everything onto my phone because I plugged it in to my computer and tried to update it, but it stopped at the very end up the update and said it had failed then wouldn't leave the progress screen, so I restored my phone, but this was happening even before that was going on.
I'm getting really sick of this and I'm getting tired of iphone problems. Can someone help? Thanks.

Answer 1

Sounds like you need to do some basic user troubleshooting, starting with a reset:
Double-tap your home button and start swiping up on your app windows (the larger windows) to close them out completely. Once they're all closed out, hold down the home button and the power button together until the screen blacks out and the Apple logo shows up on the screen, then let go. This will reboot your phone and will not cause any data loss. Let me know how the phone behaves after this.