MT5 requote errors

Causes, most likely first

1. The account uses instant execution rather than market execution

Requotes are a feature of instant execution: the broker guarantees a price and rejects the order if it can no longer honour it. Market execution accounts do not requote — they fill at whatever is available, trading the rejection for slippage. Neither is strictly better; they fail differently.

2. Deviation or slippage tolerance is set too tight

The order specifies how far price may move before the request is abandoned. Set it to zero and every fast market rejects; set it very wide and you accept fills far from the intended price. On gold, which moves quickly, a tolerance sized for EURUSD rejects constantly.

3. It is a news release or the rollover window

Requotes cluster exactly where signals cluster. Our own measurement puts median XAUUSD spread at $0.16 across all 24 hours, but the tail is where trading fails — see the published spread data. Refusing to trade those windows is more effective than tuning tolerance.

Why this happens

A requote is not an error in the sense that something is broken. It is the broker declining to fill at a price that no longer exists, which is preferable to filling you somewhere far worse without asking.

The trap is an EA that retries immediately in a loop. In a fast market that produces a burst of requests, each rejected, and occasionally one fills at a price nobody would have chosen deliberately. A single retry with a short pause is correct behaviour; unlimited retries are not.