Sometimes empty knob?

Hi all!

Has anyone an idea, why my 2 KNOB widgets sometimes are empty?
Manuel reload of the site fixes it…but actuelly the tablet turns on via motion detector so i want to see the 2 temperatures without opening the side menu of fully kiosk browser und reload the thing.

Bevore reload:

After reload:

Thx for tipps.


Does it occur on the tablet only or on desktop browsers too? Have you tried with regular Chrome?