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I’d warranty it.
I’ve read about this issue on weight weenies forum -
https://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=153126
If memory serves, it seems it maybe to do with dirt build up (or some other restriction) that stops the servo completing the shift until the obstruction disappears.
Sram Etap 11 speed, seem to have an intermittent fault with rear mech, where in in the lowest gears won’t shift either way.
Sometimes seems to “store” the shifts but not always...? Warranty it?