Seems there are a number of us that have a similar experience in the heat. I, too, was at the beach last week. I ran two longish runs and it cracked during one of them (I think the second one when I was running in the midday sun). In addition, I went to the pool a couple of days where I took my Charge 2 off my wrist (but I don't think it was in direct sunlight when I had it off my wrist as I placed it under the chair where I was sitting). In any case, the temperatures were well in to the high 80's or low 90's and there was plenty of direct, bright sunshine at the time when I was running.
The crack extended more or less down the center of the display from the top to nearly the entire way down to the bottom (see picture). I contacted customer support via chat and I provided the information requested. The Fitbit representative that I chatted with online could see when I first registered the tracker in April and requested that I send a picture along with a tracking number he supplied to me. I suspect that it may be a differential heating issue associated with how the screen is mounted on the tracker. Call it a design flaw. That black screen can absorb a lot of heat from direct sunlight.
It was determined that the tracker was still under warranty. I was provided an option of a discount on another Fitbit tracker other than the Charge 2 or replacement of the Charge 2. I considered going with the Altra HR (not as wide, but is "waterproof" as I recall), but selected the Charge 2 replacement option since I'm generally satisfied with the performance of the Charge 2. I'm concerned, however, because I have lots of summer training coming up for a marathon and a couple of shorter races in the fall and many of my runs occur midday.
The resolution of the issue was handled quickly through the chat option. If you have a similar issue/problem, I found this option to be very satisfactory.
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