I just bought a 2017 certified pre-owned honda accura EX L sport. At stop and go traffic it lightly stalls for about 3 seconds then accelerates.
It is still under warranty. Have you contacted the dealer ?
On the bright side, now you know why a 1-year-old car was turned back in by the prior owner.
Are you sure this isn’t the auto stop-start feature? If it actually ‘stalled’, it wouldn’t start back up.