Sorry not solved... 
Yesterday it was reboot again....
Reboot or just kodi crashed?
Looking at this, and the other thread you mentioned, it seems to me that it is related to some (or all) add-ons that you are using.
I and others, have been using 8.2.5 on RPi2 & 3 without any issues.
Can you provide kodi and dmesg log files, as explained in my signature, also the url from "top -b -n 10|paste".
Also, if possible explain what is happening prior to a reboot and length of time before a reboot.
Another question? Is this a fresh install or an upgrade from OE?
You also use movieshark and as this is a banned Kodi add-on Banned Add-ons,
NO FURTHER SUPPORT WILL BE PROVIDED until this add-on is removed.
Try to remove RAM overclocking
sdram_freq=400I had some weird issues like this some time ago...Rpi 2 was working fine with 8.2.3 and started acting strangely from 8.2.4 onwards..Don't ask me what the reason is cause I even posted a debug log but there seem to be nothing of any help..
Try this maybe it helps to solve your issue:
Make sure you have LE 8.2.3 installed,
Take your sd card out of your rpi and copy these 3 firmware files from your sd card to your PC
/flash/bootcode.bin
/flash/fixup.dat
/flash/start.elfNow insert your sd card back to your Rpi and update your LE to 8.2.5
Take sd card back out and go back to your PC and replace those 3 files from the 8.2.5 with the ones you saved from the LE 8.2.3...
If it works properly this way for you it may be easier to hopefully debug the issue..
vamp it's very (very!) unusual for a Kodi related issue to cause the entire system to reboot. I'm not even sure what could cause the system to reboot (apart from a malicious addon) - normally if there's a problem the system might freeze, behave strangely or Kodi will crash, but almost never have I seen the system spontaneously reboot.
The Kodi crash log you posted (from https://forum.libreelec.tv/8.2.2) shows a MMAL crash (video player), but you're saying 8.2.3 is good and 8.2.5 is bad, so I'm not sure what the relevance is of the 8.2.2 crash log?
Given the unusual reboot behaviour I would suspect a hardware issue, possibly insufficient power supply. What kind of power supply are you using, what is the rating in amps?
It is possible the firmware in 8.2.4/8.2.5 causes the GPU to do more work which changes the power profile of the device, requiring slightly more powe and, if your power supply is marginal , it could turn a stable 8.2.3 device into an unstable 8.2.5 device. The solution is to use a correctly specified power supply with your Raspberry Pi.
If you are using a correctly specified power supply, and continue to have these "random restarts" then try a different RPi board, if possible.
If you continue to experience Kodi crashing (ie. not system reboot) while playing movies then please reproduce the issue with a LibreELEC 9/Kodi 18 test build as the version of Kodi in LE8.2.5 is no longer developed, so no fixes will be possible. Post a crash log in the Kodi forum thread from the LE9 build, ideally with a sample movie, and we can investigate that and hopefully provide a fix in LE9.
Display MoreI had some weird issues like this some time ago...Rpi 2 was working fine with 8.2.3 and started acting strangely from 8.2.4 onwards..Don't ask me what the reason is cause I even posted a debug log but there seem to be nothing of any help..
Try this maybe it helps to solve your issue:
Make sure you have LE 8.2.3 installed,
Take your sd card out of your rpi and copy these 3 firmware files from your sd card to your PC
Code/flash/bootcode.bin /flash/fixup.dat /flash/start.elfNow insert your sd card back to your Rpi and update your LE to 8.2.5
Take sd card back out and go back to your PC and replace those 3 files from the 8.2.5 with the ones you saved from the LE 8.2.3...
If it works properly this way for you it may be easier to hopefully debug the issue..
Mario77 This fix is working!!!!
I copy your mentioned file to 8.2.5 and i watch a movie about 1 hour without any problem!!
milhouse It help you or other dev to investigate the bug?
