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ut800 with rtl515. problem with automatic light mode

Hi,
Whenever i'll start riding light mode go too max power. i change it to auto but edge 530 change auto to max power in a few moments later. I ride in full sun.

mostly I ride to work. it's 10 km. mostly on road. max power drain my batteries sooo fast that I have to charge them almost every day...

it's really annoying. 

don't know what to do.

i have front light more then 2 years and never had issue like that. 

it's start few months ago. 

I think maybe its 9.40 fault.