I had this happen on a refurbished Inspire 2 that I had recently repaired. I did some research. Make sure in the app that you have not disabled that by accident. If not, I took a tiny screwdriver, and under the belly below the landing gear, there is a hole with access to the spiral screw that is used for adjusting the landing gear. I moved that all the way up and down a couple of times manually, and it did fix the problem for me.