06 QX56 Heated Seats working intermittently

[Pirrone]

Hello Everyone:

Im hoping someone could help me out. My heated seats on my 06 QX56 seem to work intermittently. Its not one seat... its all 4. Once in a while i'll get some heat but then it goes off. Sometimes while hiway driving they'll click on full blast and i'll get some good heat out of them then out of nowhere they go out again. I was keeping an eye on any bumps in the road, (thinking maybe a ground was knocked off or something) but it just seems they shoot on at any given notice. Is here a defective relay i should be looking at? Anyone else have this issue? I live in Canada sooo... heated seats are pretty much a necessity. Can anyone point me in the right direction??
Thank you so much in advance