WTF is with my phone?

Keeps connecting and disconnecting from wifi. Like, once a minute. This is with all data/roaming turned off, power save off, etc.

My mom's galaxy 3 works fine. My tablet works fine. Just this...urg.

Also, autocorrect/autocomplete is the devil. How do you turn this off?

EDIT: Not sure what of the many things I did worked, but wifi seems to be up any steady, for now. However I notice that bluetooth refuses to turn on now. WTF?