I think I have a lemon

My new iPhone 6 seems to have a lot of problems, which are so frequent and annoying that I think I may have gotten a bad phone. I wanted to share some of them here to see if I'm the only one...

1. About once or twice a day, the screen goes completely black, then it pops back up to the lock screen. This sometimes happens when I'm in the middle of writing a text/email/etc. I don't lose my work (when I go back to the app I was using I'm able to pick up where I left off) but this is still an annoying issue. There's a variation of this that occurs less frequently where the screen goes black for just a millisecond but pops back to whatever I was doing.

2. Safari screens and other apps occasionally freeze. I'm then forced to go back to the home screen, double-tap the start button and close the app. Upon reopening it works, but again, this is annoying and never happened on my iPhone 4 or 5.

3. The phone doesn't always automatically go to wifi when I'm in a wifi area. I often have to go to the settings screen and select the network in order to connect. This shouldn't happen when I'm near a known network that I've connected to before. Again, annoying and time consuming and never happened on my older iPhones.

4. Most of my music doesn't sync to the phone. I purposely got the 64gb model so I could store ALL my music and ALL my photos on the phone. When I sync, I don't get errors, but all the music isn't on the phone. And when I look at "On this Phone" in iTunes the songs that didn't sync are grayed out with a dotted circle next to them. This is super frustrating and no one seems to be able to fix it.

5. I'm constantly reminded that cellular data is turned off for a particular app. I've chosen to do this, so why the constant reminders? And why do apps that don't connect to the internet (like my Chess app) even need to have cellular data at all? I know that this particular issue is not unique to me (lots of message board posts complaining about it) but I wanted to include it on my list becuase it's unique to my iPhone 6 and never happened with earlier phones.

To my fellow community members: If you have fixes for any of these issues, please note the issue number that you're writing about in your response. Bigger picture...I'm curious if people feel I might, in fact, have a lemon and whether you think I should try to get a replacement?