Suddenly losing air in ALL tires simultaneously?

[vwmaniaman]

It must be that the 31/Atlas comet is stealing earths barometric pressure and causing the problem. See if it stops after that comet goes away. LOL

 

[bonjo]

such a big difference cannot be due to temperature nor pressure gauge variation which would normally be 1~3 psi.
Most probable culprit:
mistake made or miss reading while inflating the tyres
tyres deflated before an off road event
some low like has loosened the valve