In the absence of any unexpected news event, or some other reason to shock the market, a reversal will usually not just appear out of nowhere.
V-Turn reversals happen. But they're not the usual outcome.
More often than not, there will be multiple clues in the lead-up to the reversal.
The challenge for you, as a trader, is to learn to read the clues as they're presented and adjust your bias and trade expectations to suit.