This is what I found on reddit. Not trying to defend the phone but I think a few cases does not warrant a panic.
Case 1:
https://m.reddit.com/r/Android/comments/588da4/be_careful_with_your_v20
was using the flashlight on the phone for about 30 minutes and turned it over to see this. My guess would be a defect in the glass. Any ideas? And no, it wasn't dropped."
Wow sounds like a damn hot lense, 30 minutes with a flash light. Just WOW.
Case 2:
And another that just magically shattered is his claim here: Received my V20 today and noticed that the glass on the camera was cracked about 5 hours later. Not sure if it was broken during shipping but I know I haven't dropped the phone.
Don't you think he would have noticed the shatter when removing new phone from box.
https://m.reddit.com/r/Android/comments/588da4/be_careful_with_your_v20/
Case 3:
Scratch test break . Camera Lense stressed
https://youtu.be/nBlUL-7Dl4U?t=2m25s
ANY MORE????