[bdroad]

The SME client will use whatever data connection you have set as default on your device. You can configure the client to do a schedule sync if you want to get the data usage under more control. You can also turn it off all together by disabling push and disabling scheduled syncs, then performing a manual sync when you want to check your email for even further control.

I could also review your log files to see if the client could possibly trying to connect/disconnect in a bugged type fashion.