there is no climb, and the road is flat, Garmin 540 still shows grade for more 2-10 sec...
fw:latest official
What software version, have you tried the beta (23.xx & 24.xx), some reviewers report improvement (eg GPLAMA, DC Rainmaker, Des Fit), beta includes
I have used every 1040 beta for the last two years and lived, can’t say they are any worse than the production releases although many issues are reported by beta testers but apparently ignored by Garmin and subsequently become bugs in production versions. As for the gradient the current consensus is that the new (beta) gradient IS more responsive BUT IS even less accurate than the previous less responsive version, so not a great result.