since a few weeks I have the weird problem, that after a reboot or turning on the phone again the following settings are changed as follows: WLAN is now on, automatic brightness is off, volumes are different and the display timeout is 30sec. Any idea what is causing this?
A "wipe all"-answer is not appreciated, as this is something i can figure out myself and does not lead to the bottom of the problem.
I'm using MCR r5 btw....
Sadly, I suspect a wipe is probably the only answer, unless you want to remove all/any apps you added post flash.
Think about it logically, a phone is a device with access to volatile and non-volatile memory. MOST (I believe) Android devices remember the 'state' they were in when you reboot, so if your WiFi was on, it should be when you reboot. If it's not, it's because it's told not to be.
So, if your states are changing, logically only one or more of the following can be causing it :
1) Issue with where variables are stored (i.e. changes to config are not being saved to a non-volatile area - this could be *nix file permissions or a memory issue)
2) Problem with bootup scripts (bootup sets everything as it's told, and if that is corrupt or didn't 'clear' after initial setup...)
3) You have an app (like JuiceDefender) which is changing device states for you, and possibly is confused
Android can do 'odd' things with duff config, as I've seen myself - tweaking the wifi configs by hand/script and getting them wrong can result in a wifi which cannot start/stop, and toggles states. Personally, I'd seriously try installing/running Titanium Backup, backing up all your apps/data, doing a nandroid backup for good measure, and wipe & reflash, then restore your apps one by one.
Also, I got the auto-brightness issue (it turned itself off quite often) with r5 - and I can only presume an app is changing it somewhere. It doesn't happen on other ROMs I've tried.