Have been using v3.2.1 for a couple of weeks and after every couple of flights the settings I have in APM Planner for stabilizing the servo gimbal are lost. In flight I realize it is not steady and have to go back into APM planner and re-enter the settings. I lose the RC channels, the servo ranges and the stabilize buttons. When I re-enter them, everything works fine again
Every other setting seems persistent.
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There is something strange with how APM Planner 2.0.17 handles gimbal settings. When I connect to the Pixhawk using Mission Planner the settings seem fine. When I connect via APM Planner, the MNT_STAB_ROLL and MNT_STAB_TILT parameters are set to 0 and APM Planner seems to overwrite them. So you have to manually re-enable those settings during flight which has a tendency to kill the mavlink connection as well and cause a GCS failsafe.
When I look at the actual parameters in APM planner those settings are correct, but when I use the gimbal UI, those parameters are not correct. There is some UI issue with APM planner but even though the parameters are correct, the gimbal does not work until i toggle those parameters off and on a couple of times.