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problem with 3G GSM module

Hello,

I have 4 routers with HWIC-3G-GSM installed, two of them are communicated well and another two has problem that for some time the modem could not dialin again. The modem  connects when the router is restarted. All 4 routers are the same configuration. I use IP SLA to be a modem always up.

Below is an example of router debug which has a -82 dBm gain.

example of debug:

001856: 18:46:59: Ce0/2/0 DDR: place call
001857: 18:46:59: Ce0/2/0 DDR: Dialing cause ip (s=10.40.114.1, d=212.2.96.51)
001858: 18:46:59: Ce0/2/0 DDR: Attempting to dial GSM
001859: 18:46:59: CHAT0/2/0: Attempting async line dialer script
001860: 18:46:59: CHAT0/2/0: Dialing using Modem script: GSM & System script: none
001861: 18:46:59: CHAT0/2/0: process started
001862: 18:46:59: CHAT0/2/0: Asserting DTR
001863: 18:46:59: CHAT0/2/0: Chat script GSM started
001864: 18:46:59: CHAT0/2/0: Sending string: atdt*99#
001865: 18:46:59: CHAT0/2/0: Expecting string: CONNECT
001866: 18:47:29: CHAT0/2/0: Timeout expecting: CONNECT
001867: 18:47:29: CHAT0/2/0: Chat script GSM finished, status = Connection timed out; remote host not respond
ing
001868: 18:47:29: TTY0/2/0: Line reset by "Async dialer"
001869: 18:47:29: Ce0/2/0 DDR: disconnecting call
001870: 18:47:29: TTY0/2/0: Modem: (unknown)->HANGUP
001871: 18:47:29: TTY0/2/0: no timer type 0 to destroy
001872: 18:47:29: TTY0/2/0: no timer type 1 to destroy
001873: 18:47:29: TTY0/2/0: no timer type 3 to destroy
001874: 18:47:29: TTY0/2/0: no timer type 4 to destroy
001875: 18:47:29: TTY0/2/0: no timer type 10 to destroy
001876: 18:47:29: TTY0/2/0: no timer type 2 to destroy
001877: 18:47:29: TTY0/2/0: dropping DTR, hanging up
001878: 18:47:29: tty0/2/0: Modem: HANGUP->IDLE
001879: 18:47:33: TTY515: Line reset by "SSH Process"
001880: 18:47:33: TTY515: Modem: (unknown)->READY
001881: 18:47:33: TTY515: no timer type 0 to destroy
001882: 18:47:33: TTY515: no timer type 1 to destroy
001883: 18:47:33: TTY515: no timer type 3 to destroy
001884: 18:47:33: TTY515: no timer type 4 to destroy
001885: 18:47:33: TTY515: no timer type 10 to destroy
001886: 18:47:33: TTY515: no timer type 2 to destroy
001887: 18:47:34: TTY0/2/0: restoring DTR
001888: 18:47:35: TTY0/2/0: DSR came up
001889: 18:47:35: tty0/2/0: Modem: IDLE->READY
001890: 18:47:44: Ce0/2/0 DDR: re-enable timeout

Router configuration

chat-script GSM "" "atdt*99#" TIMEOUT 30 CONNECT

interface Cellular0/2/0
bandwidth 384
ip address negotiated
encapsulation ppp
dialer in-band
dialer idle-timeout 0
dialer string GSM
dialer-group 1
async mode interactive
ppp chap hostname RTA
ppp chap password 0 zenek
ppp ipcp dns request

line 0/2/0
exec-timeout 0 0
script dialer GSM
login
modem InOut
no exec
rxspeed 3600000
txspeed 384000

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