error:metricsCCBasebandReset { reason: "modem reset: USB Fatal Error: Interface is inactive(Select Exception)"

Hi,

I m having troubles with my iphone 4s since day one of its activation: status bar displays searching every now and then, and i m loosing a lot of calls.

I have upgraded the ios to the 9A406 but this did not solve it.

i knew how to get the logs : Settings ==> About ==> Diagnostics & Usage ==> Diagnostic & Usage Data ==> and then check the awdd log.

and found it to be related to a modem reset error logged as follow:

deviceId: "546356ff6e1e8289929f00ec8dd48f4c20b5a9f7"

isAnonymous: true

deviceConfigId: 101

triggerTime: 1326539111279

triggerId: 524310

profileId: 10129

investigationId: 0

metricsCCBasebandReset {

reason: "modem reset: USB Fatal Error: Interface is inactive(Select Exception)"

inVoiceCall: false

rat: 1

PLMN: "60201"

timestamp: 1326539111279

}

I have plenty of logs like this:

If someone managed to get this fixed, thanks to advice what was performed??