Congrats on lucid dreams! 
Sounds like your awareness is low and your dreams destabilize easily. Are you doing reality checks in waking life? Reality checks help with training awareness, do them, and do them not only as mechanical action. Before doing reality check, look around and completely believe than you might be dreaming, then put emotions into it like 'Wow, am i dreaming?', and then do reality check itself, while doing it completely expect it to work and show you that you are dreaming. Check out this thread as well: http://www.dreamviews.com/dild/13212...ods-dilds.html 
As for stability, try engaging all your senses in dream, like not only looking around but trying to feel objects, smells, try to lick and taste something and hear something, there's tutorial with few other techniques that can help with that: Dream Stabilization and Clarity Tutorial - Lucid Dreaming - Dream Views , i use rubbing hands technique for stabilization. 
By the way do you have a dream journal? If not, start one and write/type your dreams in it, it not only helps with recall but also mentally sets you into dreaming mood thus increasing chance for lucid dreams generally. 
Also check out those forum sections for some beginner info and also tutorials:
Welcome
Induction Methods and Techniques
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