IPhone 3GS disconnects tethering when I receive/make a call

I use my iPhone in the bluetooth tethered mode for about 8 hours a day when at work. I have a 10GB plan and tethering is allowed by the carrier (Singtel Singapore).
However, ever since I upgraded to 3.1.3 my iPhone disconnects the tethering whenever I receive or make call. The iPhone reverts to the 2G mode and I can only switch it back after the call.
To restore I do the following steps
1. Toggle airplane mode to go back to 3G
2. Go to network mode and enable tethering, it shows tethering as 'OFF'
Its really frustrating, I have to keep interrupting my work on the laptop if I get a call, and more importantly I cannot look up information on the tethered laptop when I am on a call, really defeating the purpose of tethering.
I have done several system restores, reset the network settings, all to no avail.
Any guidance/help on this will vastly improve my workday!!

this means there is something corrupt in your backup file.. unfortunately you keep restoring the same bad data onto the phone your going to have to restore as new and start over. If you replace the phone and restore the backup the same thing will happen over and over again. Your only option is to restore as new and sync your apps and music back on sorry.

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