Onan shuts off while driving/hot

We have had this problem twice while traveling. Once was traveling from IL to North Carolina through a ton of mountains and struggled to figure out why as after that all seemed fine. Today we got stuck in Chicago area with rush hour traffic of abrupt stop and goes and I figured out not a mechanical problem per say but a fuel splashing around problem messing up fuel sensors. Hence going through mountains the fuel is moving to one side of tank or other making sensor think low on gas. Same when have to come to a faster stop than normal! Once back to a normal pace and flat surface all works great! Really can't fix it. It is working to detect what it knows of a fuel tank on level ground.