9.33 Fenix 7 sapphire solar: extreme pace errors during run

Have been seeing short pace spikes with Fenix 7 since acquired in June, now the spikes are continuous with 9.33 update. Average pace still ok, but instant pace at 3:23 makes stamina and other features unusable.

Wore both watches on opposite arms during an out & back run today, both connected to HRM. Fenix 6 pace very stable in comparison as shown below. Ran trials with out HRM and no difference in performance. Fenix 7 was in auto select mode, but see same issues when in all + multi-band mode.

Instant pace appears to be only correct on Fenix 7 when slowing down below average pace.

7v6 pace