There is a previous thread marked as solved which I have reviewed completely.
This has not solved my problem. This has been a problem for me for about a month - the device is essentially unusable in any market (4G or 3G). In the diagnostic logs I see a lot of "[RUIAUTO] Invalid packet state" errors.
System Log> HTML Version 25.
10/05/11 10:42:49am> Current Time
10/05/11 10:42:47am> NWPM_EVENT_CALL_CONNECTED
10/05/11 10:42:47am> LTE Connected
10/05/11 10:42:37am> NWPM_EVENT_CALL_END
10/05/11 10:42:37am> LTE Disconnected
10/05/11 10:42:37am> [RUIAUTO] Invalid packet state
10/05/11 10:42:13am> NWPM_EVENT_CALL_CONNECTED
10/05/11 10:42:13am> LTE Connected
10/05/11 10:42:05am> NWPM_EVENT_CALL_END
10/05/11 10:42:05am> LTE Disconnected
10/05/11 10:42:05am> [RUIAUTO] Invalid packet state
10/05/11 10:41:27am> NWPM_EVENT_CALL_CONNECTED
10/05/11 10:41:27am> LTE Connected
10/05/11 10:41:17am> NWPM_EVENT_CALL_END
10/05/11 10:41:17am> LTE Disconnected
10/05/11 10:41:17am> [RUIAUTO] Invalid packet state
10/05/11 10:40:54am> NWPM_EVENT_CALL_CONNECTED
...
Model MiFi4510L
Router FW Version 02.01
Modem FW Version 2.16.07
AP FW Version 2.10-3.0.0.5
ERI Version 4
PRL Version 15024
What should I try next?