Sandisk Micro SDHC 32GB Mobile Ultra card and HTC Inspire 4G - Hmmmm.

Bought the 32GB Mobile Ultra card for my HTC Inspire phone and there is an issue which concerns me.  When I plug the phone into my laptop and set its mode to disk drive (for transferring files), the phone immediately reboots.  I tried three times in a row and got the same result each time.  Inserting the card into the included reader and inserting that into the laptop allows me to transfer files - but attempting to error-scan the card under Windows 7 crashes the Explorer session.

FSOR, my laptop is a 2.x GHz HP Probook running Win 7 Professional.  The HTC Inspire is an AT&T phone and has not been rooted.