Blocking EOS 1200d (manual focus ?)

Hello,
I use a 1200D for capture with a Raspberry Pi , manual focus switched on the
lens, both with USB (for downloading pictures) and with remote cable release
(cable+optocouplers for triggering the camera) , timelapse every 20 minutes,
no pictures in the night . Gphoto2 version is 2.5.10.
Sometimes, the 1200D is blocking , no way to capture a picture , no reaction
from the camera. This happens every morning and most of the time, the camera
unblock after one or two hours . But sometimes , It happens also in the day
(but only one or two pictures lost).
This problem happens with a 1200D but with a 1100D , it was ok.
When the triggering by cable fail , trying to capture a picture with
--capture-image-and-download also fail.
The only way that I have found to unblock the camera is to switch power off
manually and switch it back on manually. 

I tried to use autofocusdrive=0 and cancelautofocus=1 , thinking the
autofocus could be the problem.
I have tried this :
sudo gphoto2 --set-config autofocusdrive=0 --set-config cancelautofocus=1
But when I verify cancelautofocus : sudo gphoto2 --get-config
cancelautofocus
Result is :
Label: Cancel Canon DSLR Autofocus
Type: TOGGLE
Current: 0
So I guess I don't use the good commands, or I don't made the good things
...
How to set cancelautofocus ?

I don't know if my problem really comes from manual focus , could it be
another thing ?

Your help would be welcome because I work on this problem since more than a
week without finding any solution.
Roberto.



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