I've factory reset my iPhone twice, about to be three times. has anyone else had issues that force them to factory reset their phones.

Question

So I got my iPhone 6 on the day it came out and it has been the most frustrating experience I've ever had with apple.  I've had to factory reset my phone twice, probably about to be three times once i get home from work.  The first time was trying to transfer my stuff from my old iPhone and right after it finished my iPhone 6 turned itself off then turned on to the boot up screen (the one with the apple logo) and then shut off then did the same thing.  this forced my to factory reset my new iphone literally the day i got it.  The next day i was trying to upload my music and basically the same thing happened again, forcing me to reset my phone for a second time.  Just now (its been two weeks that I've owned my new phone)i tried to get on twitter and the app crashed then my phone reset itself and when it loaded to the unlock screen, instead of my background it was just a black screen with the time and the unlock slide.  when i unlocked it, it went back to the normal background and the main screen.  Because whenever i would turn off (not power off, but put it to sleep) the phone and turn it back on it would do the same thing.  I decided to restart it (actually turn it completely off and then back on) and now it will show the boot up screen then turn off.  I understand that there is the solution of factory resetting my iPhone, but 3 times in 2 weeks is pretty unacceptable, seeing as i had a 4s for almost 3 years and never once had to factory reset it and its also incredibly annoying to have to redownload all of my stuff.  Has anyone else had this problem? is there anyway i can keep this from continuing to happen?  is it a software issue or is it the phone itself that is messing up?

Answer 1

WiseJD, thank you for your suggestions.  Well the first two restorations were the first and second day (9/19 and 9/20) that i had my 6 and both times i chose to restore is as new.  since then there haven't been any issues until now.  granted the first time my phone messed up was after i used the At&t transfer app which made me think it couldve been something that corrupted my device.  the second time though started with me attempting to download music from the itunes store app on the phone.  for whatever reason it would download but not but it wouldnt process and install the music.  Then i tried to download it from my computer and thats when the second screw up occurred. that time i dont think it was an issue of my phone being corrupted because it was already acting strangely before i ever plugged it into my computer.  This third time, i'm at work so i havent been able to do anything about it, i wasnt downloading anything and my phone was not hooked up to a computer, i simply tried to open twitter and then all this happened. and it has been a solid almost two weeks without incident which makes me think its my phone and not corrupt files.  also looking at forums, not just these but other online, i haven't really seen anyone with the same problem which adds to my thought that its a problem with my phone. 
Just to be clear, the first time this happened, the iphone would display the boot up screen then shut off then turn on and display the boot up screen, then shut of and kept going on like that until i put my iphone into recovery mode and factory reset it.  the second time the iphone would display the boot up screen and then shut off, but wouldnt turn on unless i pressed the power button again.  this third time is the same story.  i dont know if this makes a difference or if its symptomatic of different problems but i figured it wouldnt hurt to explain in detail the issues that happened each separate time.
Also on a side note, i havent done anything like jailbreak it, mess with it download or any third party apps not on the app store.