UPDATE:
After several consequential downloads, i noticed this:
Always lost answering machine wellcome message, alarm messages and reminder messages.
Immediately after one download and reset, Comfort has fired response \"OpenFrontDoor\" (ugh!

hock
Immediately after another download and reset, alarm mode has changed to \"Away\" (it was OFF prior the download)
Something strange: now i heard some \"clicks\" in the speak, like this
\"Wellcome, Secur<click> OFF\"
When i call Comfort from phone (from an external line), instead of \"Please, sign in\", i heard \"Press 1 to\".
After a full vocabulary download, all speaks reverted to normal.
I suspect there is a problem in downloading, maybe related to CRC errors or something like.
I use the UCMEthernet, buyed one month ago.
Hope this help.