This is also my first time being banned, with no warning at all

First time being banned, commemorating the first day of being banned, no multiple accounts on one device, no changing phones, no altering time. A few days ago, when receiving an airdrop, a 502 error popped up at the top of the screen, thinking it was a system issue. Yesterday, when receiving an airdrop, an unexpected operation popped up, thinking there was a problem with the account, so I contacted customer service for a manual check, which showed no abnormalities with the account. This afternoon, I was subjected to risk control.