Unless you are the original owner, and have not changed the tires to another brand, or size, your sticker on the tire inflation might be wrong. By changing tire brands, sizes, ETC, your tires might now be rated for 80 even 90+ PSI. ALL tires have the PSI recommended pressure on them, you just have to look for it.
I went from LT 245/16 D at 65 PSI to a LT 265/16 E at 80 psi. Thus my OEM sticker is now wrong. So check the tire for proper inflation.
And if you still have the 8 year old tires, better have them checked also.