tire pressure dropped?

[lucke]

drove around yesterday and the tires were fine. woke up today and my tire pressure warning light was on:hmmmm2:

got my oil changed at the dealership after work and they checked my tire pressure. they found that 3 tires were ~5psi low, but the last one was perfect???

strange. anyone else experience this?

 

[XDsm]

Yep my light has come on twice due to low pressure on just one or two of my tires. It's been months since the last time however.