I have experienced the same thing since 4.0 came out. Here is what I do:
Perform auto tune. Land and disarm. Read the settings in mission planner then click write Params
Once I do this it saves the new pids and I can reboot
I have experienced the same thing since 4.0 came out. Here is what I do:
Perform auto tune. Land and disarm. Read the settings in mission planner then click write Params
Once I do this it saves the new pids and I can reboot