My iphone4 turned off with plenty of battery

my iphone4 suddenly turned off with plenty of battery. and my on/off button does not work for me to reset it.

your battery meter is wrong. im running into the same issue without ryhme or reason. my phone was shutting off at 52% like clock work, then it moved to 58%, then finally after being off for half a hour i plugged it in one day and it actually showed 1%. problem fixed.
yet then a week or so later, it shut off on me at 35% and seems to be back to normal again.
the only way i've seemed to fix this is to use the charger that came with the phone or my ipad and have it plugged into the wall and let it say 100% for about a hour past it turning to 100. then when i unplugg it i do a shut down and restart, then i do a hard restart by holding in the 2  buttons until the phone starts to boot up again.
im on a verizon 4s 16g btw. this has been going on for about a month on mine, and just this past weekend my contacts started coming in as just numberes, no names, even if i text someone thru my contacts, the text back to me will come in as a new text under the number and not thier name. again, just randomly fixes it self after soem restarts and reproggraming by calling the verizon number.
lot of frustrations for a 4thgen phone from a company.

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