VO2 Max not updating 1040

Hi, I've recently noticed that my cycling VO2 Max hasn't been updating for nearly 5 weeks, despite having ridden many outdoors rides over that period.

Hrm is new and always wear it when cycling and running. 

My 1040 is running 26.18 software which I believe is up to date.. Tried to update but says none available. 

So, I've seen many posts on this same subject but not found a solution yet.

Anyone on here make a suggestion? 

Thanks