Problem occurred internal to model specific code

Hi list!

My environment:

[root@elx-gnokii-sms ~]# lsusb | grep uaw
Bus 001 Device 003: ID 12d1:1506 Huawei Technologies Co., Ltd.
Modem/Networkcard --> NOTE: model E3131
Bus 001 Device 002: ID 12d1:1506 Huawei Technologies Co., Ltd.
Modem/Networkcard --> NOTE: model E3131
Bus 001 Device 004: ID 12d1:1003 Huawei Technologies Co., Ltd. E220
HSDPA Modem / E230/E270/E870 HSDPA/HSUPA Modem --> NOTE: model E160

[root@elx-gnokii-sms ~]# uname -a
Linux elx-gnokii-sms.localdomain 2.6.18-371.1.2.el5 #1

My gnokii configuration:

Gnokii version:     0.6.31
SMSD version:       1.5.2

Gnokiirc:

[phone_1]
model = AT
port = /dev/ttyUSB2
connection = serial
handshake = software
#initlength = default
use_locking = no
#serial_baudrate = 19200
smsc_timeout = 10
#report=yes

In the logs, to many "Problem occurred internal to model specific code"
and command timeout causing the restarting of the connection. In most
cases with the E3131 model (blow the full log):

Text: Hi ERICK VERTIDO, you have won a save plan car, please call back.
Sending to 3516638121 unsuccessful. Error: Problem occurred internal to
model specific code.
write: [AT+CPMS="ME"<cr>]
read : [^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0,
0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0,
0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0,
0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0,
0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0,
0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf><cr><lf>^STIN: 1, 0, 0<cr><lf>AT
+CMGS=128<cr><cr><lf>> ]
Message received: 0x00 / 0x00e6
01 5e 53 54 49 4e 3a 20 31 2c 20 30 2c 20 30 0d |  ^STIN: 1, 0, 0 
0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c 20 30 2c 20 |    ^STIN: 1, 0, 
30 0d 0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c 20 30 | 0    ^STIN: 1, 0
2c 20 30 0d 0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c | , 0    ^STIN: 1,
20 30 2c 20 30 0d 0a 0d 0a 5e 53 54 49 4e 3a 20 |  0, 0    ^STIN: 
31 2c 20 30 2c 20 30 0d 0a 0d 0a 5e 53 54 49 4e | 1, 0, 0    ^STIN
3a 20 31 2c 20 30 2c 20 30 0d 0a 0d 0a 5e 53 54 | : 1, 0, 0    ^ST
49 4e 3a 20 31 2c 20 30 2c 20 30 0d 0a 0d 0a 5e | IN: 1, 0, 0    ^
53 54 49 4e 3a 20 31 2c 20 30 2c 20 30 0d 0a 0d | STIN: 1, 0, 0   
0a 5e 53 54 49 4e 3a 20 31 2c 20 30 2c 20 30 0d |  ^STIN: 1, 0, 0 
0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c 20 30 2c 20 |    ^STIN: 1, 0, 
30 0d 0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c 20 30 | 0    ^STIN: 1, 0
2c 20 30 0d 0a 0d 0a 5e 53 54 49 4e 3a 20 31 2c | , 0    ^STIN: 1,
20 30 2c 20 30 0d 0a 41 54 2b 43 4d 47 53 3d 31 |  0, 0  AT+CMGS=1
32 38 0d 0d 0a 3e                               | 28   >          
Received message type 00
Message sent: 0x00 / 0x000d
41 54 2b 43 50 4d 53 3d 22 53 4d 22 0d          | AT+CPMS="SM"    
write: [AT+CPMS="SM"<cr>]
read : [^A0+CPMS="ME"<cr><cr><lf>+CMS ERROR: 304<cr><lf>]
Message received: 0x00 / 0x0020
04 01 30 2b 43 50 4d 53 3d 22 4d 45 22 0d 0d 0a |   0+CPMS="ME"   
2b 43 4d 53 20 45 52 52 4f 52 3a 20 33 30 34 0d | +CMS ERROR: 304 
Received message type 00
lowlevel.c:463 error: 4, Problem occurred internal to model specific
code.

Is there something that I can look into?
Sometimes it works, sometime smsd finds those errors and restart the
connection.

Maybe there are incompatibilities or something that I am not aware of?

Thanks my gurues!

Rgds,