I've had a Forerunner 245 for several months. When I first started running with it, pacing and distance seemed to be accurate. However, over the past several weeks, my pacing seems all over the place. I'm physically running at the same pace (flat surfaces, not hilly, etc), but the watch will fluctuate between 9:05, 9:55, 10:30, and 10:45 all within a matter of about 10-15 seconds. I'm fairly consistent with my pace, so I know I don't have that wide of a spread in such a short period of time.
I've changed from "Smart Recording" to "Every Second Recording" to see if that impacted the accuracy, and it doesn't seem to have changed anything. Are there other settings that I need to look at, or does it sound like there may be something wrong with the watch?