To my great regret I have installed the latest firmware for the 46PFL7605H/12 model. This resulted in out-of-sync audio/video when streaming from PC. Support told me it was not possible to go back to the original firmware. Needless to say, I am not amused. Instead, I am to wait for a new software update where perhaps the issues MIGHT be solved.

What are the intervals with respect to software updates?