Should this new MacBook Pro be returned? I ordered the base model MacBook Pro 13" with upgraded SSD and RAM about one week ago. I was starting to feel I maybe bought something of a lemon—seeing things like a spontaneous shutdown, a Safari keyboard shortcut only intermittently working, mute apparently toggling itself, occasional app freezes, etc.—but couldn't find any pattern to make me believe it might not be coincidental software issues, or possibly from an external HDD working hard.

Now Mail is consistently showing unusual graphical behaviour in the message list: Mail graphical glitch (video). (Note: Empty rectangles added to censor personal data; they are not part of the problem.)

As I move about the message list with the arrow keys, the list glitches in strange ways. This happened in another folder as well. I can't find anyone else talking about this online, so I'm looking for opinions. Thanks!
Yes, you should consider returning it back to Apple and get a refund:


Returns &amp; Refunds



  
  You have 14 calendar days to return an item from the date you received it.
  Only items that have been purchased directly from Apple, either online or at an Apple Retail Store, can be returned to Apple. Apple products purchased through other retailers must be returned in accordance with their respective returns and refunds policy.