My Garmin Forerunner 735XT has started messing up intensity minutes.
On Mon 12Feb2024 I did a 63 minute ride and it gave me 61 intensity minutes (all good).
On Tue 13Feb2024 I did an 18 minute run and it gave me 20 intensity minutes (all good).
On Wed 14Feb2024 I did no recorded activity but it gave me 13 intensity minutes.
On Thu 15Feb2024 I did a 31 minute run and it gave me 68 intensity minutes.
On Sat 17 Feb2024 I did a 62 minute ride and it gave me 128 intensity minutes.
On Mon 19Feb2024 I did a 68 minute ride and it gave me 138 intensity minutes.
On Tu 20Feb2024 I did a 31 minute run and it gave me 112 intensity minutes.
From above, problem started Wed 14Feb2024.
Was there a software upgrade ? to either Garmin735XT or to iOS app ?
Settings shows current version is 4.62.1.3.