Taking that the hardware is OK, my shard on 96 core started to crash at random point of time.
The first symptoms - it stops executing all the scripts + none is able to log-in, but if you are inisde the game you can talk and walk freely. Nothing else works. When trying to ctl+c and save, it gives a crush dump.

I recently updated to the lastest 97 core, but the crash persists. Is there any way to localize the crash reason?
I have made so many corrections to the scripts its physically impossible to make it out jusy by reverting the changes. No any particular action inside the game causes it.

I wonder if someone could recall the similar situation on their shards.
Thank you in advance.

If it generates a crash dump, post the dump on the bugs forum. Just wondering, do you have a line in your POL.cfg AssertionFailureAction=continue

if its continue, hitting an assertion failure will cause things to stop working correctly and other weird issues. If you do have this line set to continue, the best way to gracefully use it is to set it to shutdown. This way, it will at least save before closing. If you don't have this line at all, then this is not the problem since by default, POL closes without saving.

Thank you for your reply.
No I don't have AssertionFailureAction in my pol.cfg.
Yes I have dump files, but they aren't really comprehedeable.

You likely won't be able to comprehend them yourself but the POL core devs can. Make sure you're using the latest version of POL off the website and if the latest version generates a crash dump, the core devs can use it to figure out the problem.