Very strange.

Bought a 2010 CPO with tech package last November and had weather and traffic free for 6 months.

Looked at the screen today and the weather icon is back on the nav screen. I even clicked on the info button and yep...it's there.

 

Check your credit card bill. You might have been "renewed" automatically. Or the prior owner might have had it happen to him/her. I never heard of a 6 month free trial; they're usually only for 3 months.

 

My battery completely drained while parked in the garage during a long trip away from home. Once I got the battery charged up the Navi started showing traffic and weather and XM started to work and continued for about a month. I guess I got a new trial period because of the reset.