Hi,
Also bought my G80 from UK and still not find solution for the 30 mn time limit.
To restore initial settings, you have to use the right button.
You can see this service manual who explain all (same as gx80), page 20 :
http://www.panasonic.com/content/dam/pim/au/en/DM/DMC-GX/DMC-GX85GN/LUMIX GX85 Operation Manual.pdf
The click on this link strangly doesn't work, so you have to copy and paste it directly in your web browser.