Factory resets dont make a difference in battery life?

So I've had this issue on two different Galaxy devices: a Note 5 and S7. Both these devices were bought new, both had excellent battery life when new, and both began to see reductions to battery life 4 months in. I'm now seeing 3.5h SOT avg on the S7 compared to 4.75 when new, but the crazy thing is that a factory reset doesnt bring it back to new levels. I realize the battery does age, but that shouldnt happen this badly this quickly, also not while my mom's GS6 has somehow maintained a 4h SOT avg throughout the whole year it's been used. Do f. Resets just not make a diff anymore?

Problems with MM rebooting (even after 2 resets)

Hello,

I have a new AT&T H900 not rooted for past 5 months. It was working fine until the MM forced update. It started to shut down (apps stopped responding) some of my apps. I read that I needed to reboot fresh, so I did. Even directly after reboot, apps still kept shutting down (stock apps like Google, messaging, just to name a few) at different times, even before adding my old apps. I decided to reboot a 2nd time with the addition of clearing the cache every time ( I read somewhere that this should help). It seems that the apps seem stable, but now my device keeps rebooting at a moments notice (specifically when it is computing multi tasks). It has become very unstable. How can I fix this? Should I try a 3rd reboot? Thanks.