How do you handle position sizing when market volatility spikes unexpectedly?

Been trying to stick to my pre-defined risk per trade, but with these recent intraday swings, especially in some of the smaller caps, I'm finding my usual methods for calculating share size are leading to much larger swings in P&L than I'm comfortable with, even when my stop loss is respected. It feels like either my stop gets hit too easily due to the expanded range, or if I widen it, the position size becomes tiny. Are you guys adjusting your risk-sizing algorithms on the fly during periods of high volatility, or do you simply stick to your plan and accept the wider variance in outcomes?