Looks like the majority of the altcoin prices are all down now as people are trading their altcoins for more bitcoin in preparation for the upcoming fork so they can maximize the amount of bitcoincash they can get on Aug 1st.
I think recent price drop is due to lack of development. Look Solarcoin github. There is no activity within last 6 month.
There hasn't been a wallet update in a bit, but that's getting attention. There are plenty of developments for Solarcoin, they just aren't focused on the wallet software, however there was a bounty for updating the wallet.