How to fix iPhone alarm problem?

My iPhone has a habit of going off without any sound, even though the ringer is on and turned up nice and loud so I can hear. Even if it's worked before, sometimes it'll decide that on a certain day it's not going to make any noise. I've missed classes over this and I'm worried because I have one class that is pretty strict on attendance. How do I fix this issue?

Why are all my friends dumping me, all of a sudden? Is it something personal?

I helped one of my friends through a period of severe depression, put clothes on his back, food in his mouth and a roof over his head. He was normal for a while, until one of our mutual friends suddenly blocked me on her iPhone for no apparent reason, another mutual friend started backstabbing me to the depressed friend I helped and then the female best friend started making snarky comments and asking for expensive birthday gifts. The male best friend started demanding 5 course meals and commented that the dinner night would be bland with just pizza instead. What was going on here?

IPhone 6s Plus camera shaking?

I've had my phone for about 3 years and all of a sudden the camera (in the back) started to shake every time I want to take a video or picture. I didn't drop the phone, expose it to water, or damage it in any way. (And for the people who will say this, I do not have shaky hands. I know for sure it's not me moving the phone wrong. It shakes a TON when it's completely still.)
I know this was a thing with a batch of 6s plus phones, but mine is not new. And it started doing this all of a sudden. The front camera works fine though.