Maybe installing a mesh bungee across pannier opening (not the door) will prevent loss?
https://www.ebay.com/itm/BIG-BIKE-P...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
Great minds think alike, Ray. I was JUST thinking about either a mesh bungee where I could undo one side or even a bag and a single bungee cord stretched side to side. Still don't want the door to open on it's own but at least I wouldn't lose anything.