Firmware 21.09 problem with sram red etap

Do you mean gear position/size rather than speed?

Try deleting the SRAM airing and add it back to the Edge.

Have you recently updated the SRAM firmware? If so you may need to go through the shifter pairing process again with the reset of the SRAM system.

So to be clear the issue with the speed sensor and not the SRAM eTap system?

El problema está en el sistema de cambios Sram Red Etap, ajusta mal las marchas y se desconecta continuamente. Borrar sram red red etap y volver a vincularlo no funciona.

Not sure if it is the beta, I’’ve had this problem since last september, with beta and the last release version.

Beta problems should be reported in the beta forum, not in the normal forum. 

I have this issue too. I sent a RD back because I thought it was faulty. Replacement has the same issue. It alternates between thinking there there are 2 or 4 chainrings on the front and it beep constantly as it flicks between the configurations. I see this on 840 and 965

Same problem !