Last weekend, my wife and and drove home from Cincinnati, OH to Richmond, VA. We were on a long, strait, flat highway in Ohio with autopilot on. Sitting upright in the seat as I normally would, the car tells me to hold the steering wheel once every few minutes, give or take. A ways into this boring stretch of highway, I slouched in the seat to get a little more comfortable ( I scooted my butt forwards and leaned back against the seat). As soon as I switched to this position, the car asked to to hold the steering wheel. 30 seconds later, it asked again. As soon as it asked me to hold the wheel, the boarded immediately started flashing every time. It went on like this for a while, asking every ~30 seconds , and I was rather confused as to why it was constantly asking for attention when nothing had changed but my seating position. I went back to sitting upright and it went back to normal, asking me to hold the wheel every few minutes. I went back to the slouched position and it reverted back to asking me every 30 seconds. Absolutely nothing had changed with the speed, slope, curve, etc. I tested it several times going back and forth in seating position and the change was consistent. Has anyone else experienced this? Can anyone explain how the car determines what it may deem a less safe position for the driver?