Yep, Unitrunker is a really awesome software. If they added DMR, I think it may be the best.
I have even followed 4 seperate systems with TWO SDRs by creating 4 VFOs, 2 signal and 2 voice.
To give you some assurance, when I started with Unitrunker, I was confused and couldnt get it running, but once I did, it clicked and became really simple.
As for the signal - try playing around with your antenna if possible. Unitrunker is pretty sensitive, and I find that it decode audio that my BCD436HP cant, with the same antenna/orientation. I do have to find the sweet spot of direction to point the dipole I use - you can figure out the direction to point by opening the signal window and clicking untilk you get to the waterfall display. You can tell when you are moving the right way.
Im trying to think what could cause voice to disappear like that. Possibly the CC switched? EDACS does that often. Can you upload a screenshot?