same thing
The same thing happend to me 2 weeks ago during a moist day. Before that it never happend. (also new battery etc..)
I have a rather bad rubber handle, because it doesn't fit very well. If I squeez it to hard you can see the inner electronics and water may enter without me seeing it.
It feld as if the cocking wasn't going totaly the the back, so I changed the cocking back rod so it would back more and that seemed to help also a little.
I have to test it again, to see if it's still the problem.
For the rest I freaking love the thing.
BMF
Belgium