Fenix 6x Sapphire v26.00 backlight flickering and stops working

I took off my Fenix 6x Sapphire before bed last night and plugged it in for a charge. It started doing an update automatically, now it’s at V26.00, and now the backlight isn’t working properly. The backlight flashes on for a millisecond when first pressing the backlight button, but nothing after that.

I notice that if the Backlight ‘Not during activity’ setting is at 60% or greater the backlight comes on but it flickers, the greater the brightness the less flicker. But at 100% flickering is still noticeable. If it is set to 50% or below it won’t come on, it may flash a little but the watch isn’t readable.

It’s like the watch CPU is too busy to keep the backlight at it’s set brightness.

Any ideas on how to fix the backlight? Off/on has been tried.