First, obviously make sure your DR/EPA isn't set correctly and your transmitter actually sends 100% according to the display.
Then you could try to change the update rate in the RX settings to match whatever the ESC is expecting, I've had some problems when those were mismatched before. As a last resort maybe also try analog mode.

Have you tried a different transmitter too? Every time I thought I found a problem with my NB4 it turned out that it also happens with other transmitters and the hw was faulty/set up incorrectly.