I have had my 05 TL w/ Navi since 11/08 but I haven't really messed with the radio or XM a lot.

I just noticed that this past few days that there is a lag between the tuner knob and the station being displayed on the navi screen and near the clock. The station changes but the station on the both screen remains the same.

I also experience a "sticky" or sometimes non-responsive switch on the steering switch for the voice commands, is there a relation between the 2? I check both problems minutes after start-up.

The problem would go away after a while of driving. Buttons and screen functions for navi are not affected.