By reduction I mean that I moved the undetvolt closer to 0 or stock value (Edit: I don't know if it makes sense generally but anyway). This also means that the CPU uses more power, closer to stock levels. My undervolt was -80 millivolts as offset but now I have it at -50 mV.
Also yes, as soon as I only reduced the cpu undervolt, initially to -60 mV, the game worked. Then I tried again with the original -80mV and the game crashed immediately. However at -60mV there was one more crash after already playing the game for a while and launching it few times, so I went to that -50. At the same time I reduced my GPU undervolt from -30 to -20 mV just in case. After that there has been no more crashes. To clarify, I am pretty sure the issues was not caused by the GPU undervolt because I already had tried going full stock settings with the GPU earlier and didn't help at all.