After using Amiga for some time, one day it finally gave up on RTC, so now I have NO real time clock in my machine, which buggers me quite a bit.. On the bright side, AOS 3.1.4 now boots without any crashes, so stability issue was indeed related to RTC circuit. Now I go figure out and make RTC present again. Maybe try to change new latch chip (U177), as it had corroded pins.