The continuous restart of your MacBook has nothing to do with Usenapp.
Usenapp uses Power Nap to prevent downloads from being interrupted as soon as the MacBook wants to go into sleep mode and this has never been different, but that has nothing to do with the continuous restart of your system.
Nothing has changed in the last update that could cause this. I don’t see this problem on my macbook either and I have not heard anyone else about this.
In short, apparently something else causes this on your MacBook.
The Line “Sleep 1 ** (Prevent sleep by Usenapp) **” is a cause by Power Nap, but this is what Power Nap is meant to do.