Radio signal crashes all the time

Hello everyone,

Sorry if I do some English mistakes

I've had an Orange San Diego since last June, it works very well, but, since a few days, the radio/mobile network doesn't work all the time. After the boot, I have my network (Orange F), but few minutes later, I can't access to any network (in the notification bar : network grey with a cross). When I forced to search a network, I obtain an system error. Only a reboot can solve the problem, or, sometime, the network comes back during a few minutes...

I do an investigation. According to logcat, my modem has crashed.

E/NfcService( 1445): Selection of SIM card SE failedjava.io.IOException: UICC not detected
E/ConnectivityService( 1334): Attempt to connect to mobile failed (radioTurnedOff).
E/AT_MANAGER( 1254): onerror: Modem still alive, try to recover after 500 ms
E/AT_MANAGER( 1254): onerror: Modem still alive, try to recover after 500 ms
E/STMD	( 1259): ReportModemCoreDumpToServer - Enter
E/STMD	( 1259): ReportModemCoreDumpToServer - Exit
I/CDRDR   ( 2942): /system/bin/mcdr Version:Mar 23 2012 23:44:41
I/CDRDR   ( 2942): Start memory area: 00080000
D/AndroidRuntime( 2941):
D/AndroidRuntime( 2941): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
W/ActivityManager( 1334): Unable to start service Intent { act=com.borqs.bugreporter.BUG_NOTIFY (has extras) }: not found
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/00080000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: FFFF0000
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/FFFF0000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: FFFF2000
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/FFFF2000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: 60000000
D/CDRDR   ( 2942): Bad FCS, rerequesting SN=0x001D7C08
E/ia_watchdog( 1257): Timer interrupt
E/ia_watchdog( 1257): waiting for a timer interrupt
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/60000000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: 604E64C0
D/CDRDR   ( 2942): Bad FCS, rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x003CB008
D/CDRDR   ( 2942): Bad FCS, rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Resend Wait: rerequesting SN=0x0052F808
D/CDRDR   ( 2942): Bad FCS, rerequesting SN=0x00685C08
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/604E64C0_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: 40041000
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/40041000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: 43DC0000
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/43DC0000_ts20120813115811.cd
I/CDRDR   ( 2942): Start memory area: 43D80000
I/CDRDR   ( 2942): Comleted memory area: /data/logs/modemcrash/43D80000_ts20120813115811.cd
D/CDRDR   ( 2942): PING NOT Found!
I/CDRDR   ( 2942): Modem Crash data captured succesfully
I/CDRDR   ( 2942): Modem Core Dump files were saved in: cd_SUNRISE_SMB_REV30_V2_B1202_1208.K_20120813115811.tar.gz
D/CDRDR   ( 2942): Recovered from 4 FCS errors
D/CDRDR   ( 2942): Recovered from 0 Frame Overflows
E/NfcService( 1445): Selection of SIM card SE failedjava.io.IOException: UICC not detected
E/ConnectivityService( 1334): Attempt to connect to mobile failed (radioTurnedOff).
W/IInputConnectionWrapper( 1334): showStatusIcon on inactive InputConnection
W/InputManagerService( 1334): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@341f66e0
E/Tethering( 1334): attempting to remove unknown iface (rmnet0), ignoring

Moreover, the SIM Card looks like unavailable (according during my test with *#*#372#*#*), the app Sim Toolbox (Orange+ in France) can't be launched, and I have in logcat this message in (boucle) :

E/		( 1263): Can't open /dev/gsmtty7, -1

Before the crash, I have all the gsmtty in /dev, after the crash... nothing.

I tried to reset my OSD (Power + Vol Up) : the problem still exists.

I haven't tried to flash with the Xolo firmware, because I don't want, for the moment, to brake the waranty (I don't know if we can go back to the original OSD firmware...).

So... Is it an firmware problem or an hardware problem ? Have you got the same problem sometimes ?

Thanks !

PS : I attach a dump file of my modem (but I don't know how to read it).