I'm not sure if there is anything that can be done about this, and I expect the response of that its just the luck of the dice, but my group has had an issue with an absolutely absurd amount of 1s resulting from d20 dice rolls. I thought it wouldn't hurt to at least make a post about it so it gets seen in case this issue is the case for any other groups. I started my first campaign on roll20 about a month and a half ago, and every night we have at minimum 10 natural 1 results from our d20 rolls. I will be keeping track from now on so I can bring more hard evidence of this, but it has been a major issue of the group and really lowers morale when the amount of these rolls are so high.