help. General M4L device debugging process

Hello.

I need some advices, I am very disappointed.
maybe a noob question
When I work on a device with the use of live.object/live.observer,
there is soooooo much a different behaviour between when the device is in edit mode or not.

I know there is a general latency when a device is edited.
But there, for example, when the device is in edit mode there are so many error in the console about live.object... but not when not edited.
Lot of things work when a device is not edited and don't work while edited.
It's so hard to debug.

It's a general question.
How do you deal with that ?
Every one see what I am talking about ?
How do you manage to work properly when the behaviour of live.object/live.observer seems so different if you edit or not the device ?

thank to put some light on that..