Norbert, I am still having issues with key exchange timeouts. This is happening with both my mikrotik RB4011 router and my D-link AP. No other device in my house if having timeouts, just the OS2.
I have found that if I unplug the power for a few seconds and re-power the OS2, it will connect. I can easily replicate this by just disabling my AP or router wifi and then re-enabling and waiting to see if the OS2 will try to reconnect successfully. As you can see in the jpg the signal strength is not bad at all. The OS2 is about 3 meters or so from the router so its not a signal problem.
We have had this discussion in the past and between you and Lajos trying to help...its still happening.
Any ideas why its just the OS2 that is having issues with both of my 2.4 access points running on different platforms??? If need be I may need to log the sercon data so you can see what my OS2 is seeing if that will help