Random, unwanted transfers

I’m running the most recent 1.2 release at home with 1 POTS line which runs into a Linksys SPA-3102. OS is Slackware 12.0. Recently my family has started complaining that during a call, out of the blue they hear the “transfer” announcement, then the call disconnects. I do not believe that the # key is being pressed accidentally.

I have not seen this behavior until recently, and the only recent changes I’ve made were the upgrade to 1.2.29 (from 2 or 3 few releases back), and replacing a Digium PCI card with the SPA-3102

Has anyone heard of such behavior? I’m not sure where to begin hunting so any suggestions are welcome.

I’ve found more information which may help someone help me.
In /var/log/asterisk/messages, I see the following entry at times which I think coincide with the unwanted transfer announcements:

File /var/lib/asterisk/mohmp3/fpm-calm-river does not exist in any format

However: root@pbx:/var/log/asterisk# ls -la /var/lib/asterisk/mohmp3/ total 6608 drwxr-xr-x 2 root root 4096 2007-06-23 16:36 ./ drwxr-xr-x 8 root root 4096 2007-06-23 16:37 ../ -rw-r--r-- 1 root root 1939812 2007-06-23 16:36 fpm-calm-river.mp3 -rw-r--r-- 1 root root 2582496 2007-06-23 16:36 fpm-sunshine.mp3 -rw-r--r-- 1 root root 2217563 2007-06-23 16:36 fpm-world-mix.mp3

Thanks for looking