I had a few complains from the customers that sometimes the WAVE stops when lifting with no apparent reason.

I came to found out that it was a faulty fuse.
Interesting thing is the fuse didn't burn out, but the body of the fuse breaked from the screw "hook".
Here's a picture:
h*t*t*p://tinypic.com/r/2weih54/5
I solder it back again and received no complains after.

This happened on quite a few WAVE's that I check this on regular basis.