Hope this will be the end of long-to-be-predictable trilogy of my server, Atijembar.
I went to Norrod Computer, Groningen, for RAM replacement, because it is still in their guarantee. The replacement has higher frequency, 400 MHz, and at 15.30 Atijembar has been ready to serve with 640MB memory size. The /var/log/syslog contains no error related to system, such as segmentation fault or part of kernel crash after one day run with its 128MB RAM.
Go, Atijembar, go!