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Does the bite point return, or wander, if you rapidly pump the lever? 'Wandering bite point Shimano brake' will bring up dozens of guides on how to fix this with MTB brakes, though I'll admit I haven't experienced this with road levers before.
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100% def a leak somewhere
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Check if both pistons are moving freely and equally. I've seen lots R7000/R8000 calipers do this when one of the pistons has become sticky or completely stuck.
JacqueLucque
Glws
Harry 
@samrensho
Can someone help me understand what's going on?
The RH r8070 lever keeps losing pressure in the hydro brake line. I've bled it 4 times and it comes back but after about 400, 500km the bite point is at the drops again. It's not spongey, just the bite point of the lever is all the way back.
There no visable oil anywhere, on the brake caliper, under the hoods, on the shifter or on the bars.
I'm totally lost for ideas and it's driving me crazy. I don't have the money to just replace the lever, line and caliper.
Any ideas?
dbad