Share 'Is it just me? Ace strings'

I just got 2 aces in back to back rounds (2 days), and have only 1 other ace all year, and before that it was about 6 months since my last ace. Why do they come in strings? Anyone else get this? I've had 2 aces in the same round twice and have also gone nearly a whole year without an ace. I've had 3 aces in a week and then none for 6 months.