Bad BME280 readings

My BME280 sensor was showing 100% humidity all the time so I found an identical breakout board and replaced it. The new one worked for a bit, but now I’m getting bad readings for all the values:
BME280: 370.00°F RH: 100.00% Dew: 370.00°F P: -256.98 hPa ADC: 0.05V

Any ideas?