It could be that bub has just moved into a different spot where you can't feel it... Completely normal when they're still so small. Bubby could still very well be kicking away like mad, but possibly into your back or something that you just wont feel as yet.
Happened with both of mine, with my first I really freaked out and went to my Dr who did a scan and bub was kicking away, it had just moved, thats all.
It really doesn't matter how hard or soft the kicks are and feeling the kicks as the other ladies have said can come and go for days at this stage.

I wish you all the very best with the second half of your pregnancy. xx