New Motorola V80

I just purchased a new Motorola v80 on Saturday. On 2 mornings since, Monday and Wednesday, I have had an issue with the left-side of the screen after it is turned on in the morning. The screen has 2 black shadow curved lines in it; almost like when you touch a laptop screen &/or something is shining on it funny. They are there for about 1 hour and then they go away. The only thing I can think of is that it is coming from being charged? I charged on Sun.nite and Tues. nite. Since it didn't happen on Tuesday (and I didn't charge it on Monday nite)?? I have called the store and am awaiting an answer, but there is nothing to show to them by the time they are open (11am). Is something causing this or is the screen defective? Thx
Julie