It is the settings about timing out the connections... just leave anything on the #6 Data alone and you'll be fine.
To resolve the issue use the "delay on answer" fix .. Shaggylive's cab is the one (there are several) that works perfectly for my PRO and Diamond..
Here is link (this will resolve the issue but doesn't make it so you CAN use #6.xx settings in Diamond Tweaks, you're better off leaving that set alone).