Y'know, I have a couple unfinished fanfictions floating around on this site.
So first - I am not dead. Gina is very much alive. Sup, Mupps!
To kinda go off my original statement way back on the first page and to echo MK here, I know I owe you guys stories, especially when I started one thinking I could finish it before I got busy and...yeah.
Ironically enough, I'm actually on a slight break from writing. I managed to finish two stories in one fandom and finish two chapters in another, while also doing some side writing. It was boredom tonight that made me go "you know where I haven't been in a while?"
But as everyone as mentioned, it's just time. I lucked out - if you can call it that - with a good two months of free time before I start training for a new job next month, so I worked on stuff I wanted to get out of the way. However, that stuff right now is split between two different shows and I have two unfinished stories in different other fandoms. This doesn't even cover the stuff I have on my website, which I finally updated, but which ALSO has unfinished items that need to be addressed.
The muse works when the muse wants to work. I find the best way to make sure I don't lose ideas is to write them down. The internet is a great place for writers right now, with apps like Evernote and OneNote and I will personally tout the awesomeness that is Rocketbook. I found that if I write out my ideas, they have a place to live and most importantly, they aren't constantly rattling in my brain. Then, when I have the time and energy, I just go back to read what my idea was.
Now, as MissKermie mentioned, yes your writing style may change, but this is one of the reasons why I, personally, go back and reread my own writing. ESPECIALLY if I'm about to write the next story in a series. Not only do you remember your own writing, but you start to remember the situations, the voices, teh settings, whatever else that plans into your extended universe. Heck, I also go and watch the very show/movie I started with and THEN will go through my stories. It's a long process, but I'd rather write back up to where I was than laze out, you know?