Since the last update, grade calculations are slow to respond. Whether on incline, flat or decline, the percentage lags significantly. As such, cumulative elevation gain is significantly below peers. This weekend I did a 66 mile route with 5k+ in elevation gain; however my unit registered around 4.5k feet. My peers were all around 5k - 5.1k withe Garmin units (none were 830s). Any ideas?