It happened again
Ash history corruption...

Just for info:
I updated my system to kp 50 and busybox 1.20.0 hand other devel stuff).

Yesterday night my N900 did shutdown unexpected (batt is old, keeps me up 1 day, but on low voltage just let my N900 "die"; i. e. it does not terminate all processes nicely. just kills and is off, in below 2 seconds time).

This morning I had again corrupted .ash_history (see att).
This time it looks like some conf file, but I also had already parts of my e-mails or other unrelated text. It looks like the text is randomly taken from memory or file system.
So I can confirm the cause (x-term killed "unnicely", but do not any clue about reason).

I had two x-terms open, one as user and one as root, and it happened to both it seems. Once I checked for root history it contained only the last few commands entered this morning. After closing user x-term, I checked user .ash_history and it contained also only the last few commands.

Maybe this helps you, iDont?
Not demanding anything, as this happens rarely and is just an inconvenience.