One thing more... Yes, your graph looked exactly like mine did.
I have gone through 3 of them. The first one quit working everytime it rained, had a hell of a problem connecting to wifi. I sent that one back to Amazon and exchanged it for a 2nd. That one connected fine to the wifi (although on the other one I got a honking big router. in the mean time: Linkysys WRT 1900 ACS ) and the panel worked fine. However, that one didn't hold the charge as your isn't doing.
So I contacted the again and they sent me out the one on the pole. It charges fine, but the wifi is weak. I had to download an app to run back and forth inthe yard to find the best location. I did find it.
I am guessing the following are true:
1. the solar panel is fine, but the charging circuit in the Sky1 (and maybe the same in the Sky 2 , more on that theory coming up). If yours isn't holding charge have them exchange both the panel and the unit.
2. The wifi transmitter in the unit is flaky. It isn't that strong. I asked them why not go with something robust like the 5GHZ, but they said they wanted distance over strength, which goes with the transmitter isn't strong. Although the Davis isn't a wifi unit it gets good range from where my console and Envoy are. The Bloomsky isn't. I had it next to the Davis and for 2 units that worked, the replacement 3rd, bleah.
I figure that when they did the Sky 2 unit, they said they made it easier to set up with Bluetooth, but also it connects with wifi. They also moved the UV sensor to their Storm unit. I am guessing the second unit connects to the first unit (they updated their iphone app last night .it shows it) Now that is two minor changes.
Most companies don't do a Kickstarter fundraiser for two minor, insignificant changes. I am guessing they know the charging circuit is for shit. I have a friend in Michigan who sent his unit back. It failed to hold a charge after 8 days.
So what I would do is tell them to send you both. If they say they don't have any in stock, see if they will do a deal on the new one for you. I am betting not, but worth a try.
It hasn't been 8 days since the new one came aboard. Yes, it does lose the signal when it rains.