My smartphone never goes automatically to sleep mode

My smartphone : Fairphone 4
My /e/OS version : 2.1-t-20240603406607-stable-FP4

Since 2.0 version (well, I’m 100% the problem is on 2.1, but I think it appeared on 2.0), my FP4 never goes to sleep mode by himself. If I do not press the power button myself, it keeps the screen on and drains the battery.
I’m quite sure it is well configured. It is supposed to go to sleep mode after 60s of inactivity :

  • after approx. 53s the luminosity is a bit lowered (sthing like 50%)
  • after 60s : the screen is black
  • after 65s (i.e after 5s of black screen) the screen is waken up
  • at 65 + 53s the luminosity is a bit lowered (sthing like 50%)
  • etc. etc.

Please help me solving this annoying behaviour

Fred

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