What to do when Samsung Galaxy S5 is experiencing a lot of issues?

My galaxy s5 keeps turning the wifi antenna on and off, I turn it off and went into the advance settings and stopped it from searching and coming on automatically but it still comes on, anyway to stop this? Also my phone has been showing a lot of mobile data error codes, they go away but they do come back. Anyway to correct this issue as well?




Usually, when I experience something like this on my phone, I try to trace the problem or simply restore the phone to factory settings. :)



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