I've had the same problem, although the loss is usually to the front end of the slice for me. There's a solution I've found that works, which is to insert a second or so of low level and inaudible noise at the start and end of the silence where you want the file to be split - provided the db detection level is set high enough this works perfectly. It may seem a hassle to set up, but it can be done reasonably slickly by setting up a small file containing an appropriate length of silence with a short length of noise at each end. This can then be pasted into the gaps where you want to split, using Wavepad or similar software. Hope this helps. I've also contacted NCH technical support who have said they will pass the problem on to the developers.