Axesstel modem ignoring everything

Hello!

I've installed Axesstel MV100 CDMA modem on 7.2 server, it got attached 
by ucom and worked well ... for some time, despite console messages

Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(a, 1): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(b, 1): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(0, 2): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(3, 0): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(2, 3): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(1, 0): STALLED
Jun 16 05:56:41 server-1 kernel: ucom0: ubsa_request(10, 191): STALLED

After a night of inactivity, it ceased to work. ppp dropped and was 
unable to reconnect, connecting with cu showed PPP packets, sometimes

$QCMTI: ALIVE

and no reaction on break, +++, AT, drop DTR.

After several attempts, I've managed to hangup modem and reattach ppp; 
however, after one more night modem became completely unresponsive. 
Similar problems were mentioned in some Polish Ubuntu forum, without 
meaningful response.

Maybe someone has found a way to either make Axesstel properly react on 
break/dtr, or at least a way to reset it? I am unable to install 
sysutils/upower since the server is connected by much more expensive and 
slow GSM modem, and upower requires dbus, gnome, and, most likely, will 
request video codecs and OpenGL. Besides that, I haven't found in upower 
manuals any clues on just resetting the USB device.

Thanks in advance

Alex.
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