I want to get mention something - I think, it was BrandonBoss, who wrote about it - sorry if not:

Not be afraid of loosing an LD - but while having that fading phenomenon - mentally prepare for a DEILD right back.
Like stay still, eyes closed, re-enter.
The only two DEILDs of mine were LD-LD, too - and I find the thought very re-assuring!
Instead of spinning or panicking or whatever - just use that realization, that the LD is about to end to set you up for DEILD.
One could get rid of unnaturally short lucid dreams due to negative expectations like this - not just chain LDs.