Dismount camera module and clean its contacts with 96% vol alcohol.
This happened to my FP3 (non +) while I was having trouble to charge it months ago.
The problem seemed to go away after dismantling and cleaning all contacts with alcohol, which is how I solved the charging issue.
There was a software update around the same time so I cannot be 100% sure.
I observed the issue a few days ago but it is not happening right now.
I am using the latest update since today.
Today I received the monthly security update for my FF3+
After the update the Flashlight works normally!
In the past I have re-booted my FF3+ several times, but only the software update solved the problem.
Have you solved the problem by using cleaning alcohol? I have the same problem for 5 months by now. Have not tried to solve it because I was mostly travelling. Hoped it disappeared because the last 2 weeks it did not flicker. After a new start of the Phone it started to flicker again. If it worked for you, I will give it a go.
This issue with the flash light seems similar to what I am noticing now on my FP3 with the newest camera module. The flickering seems brigthness related. it alternates kind of in the same tempo as a car’s blinkers relay clicking when on. Can somebody confirm that this could be a bad connection in the hardware issue or is it a software issue?