Jakub Ouhrabka <jouh8664(at)ss1000(dot)ms(dot)mff(dot)cuni(dot)cz> writes:
> Is there anything I can do for further investigation?
I'd suggest trying to verify or disprove your suspicions of bad RAM.
Run memory tests, warm the chips with a hairdryer and test again,
that sort of thing.
regards, tom lane