I've never listened to the feed. It could be that it is receiving a poor signal, which "breaks up" to the point where it stops being able to be converted to voice.
I don't have a BCT15X, but if it has the option to force reception of a talkgroup to "digital only" vs "all" or "analog only", the feeder might want to try that.
As for low volume, that could be anything from mixed-up AGC settings to simply having the volume knob on the scanner (or the line input on the feeding PC) turned too far down. Might be worth clicking the "report a problem with this feed" link.