Hi! That's a common problem for many especially in the beginning. However, while it may happen, it doesn't necessarily always have to happen. So one advice for the long term is don't always associate the moment of becoming lucid with instability.

There are a number of reasons for instability, lack of experience, excitement, lack of focus or simply catching it at the end of REM. The dream is made from your thoughts and you need to support its existence by feeding those thoughts (which manifest as objects) with your attention. We usually recommend immensing in the dream as much as possible, engaing your senses, giving your full attention to what is in front of you. You may also try rubbing your hands or touching the surface of different objects.

Also, having a task in mind of what you want to do in the dream will help prolong the dream by keeping you more focused. Check out some cool tasks we do monthly:

Tasks of the Month & Year

Also, here's a great podcast on stabilization:

http://www.dreamviews.com/dreamviews...-mistakes.html

Good luck!