Odd, I guess if its perceived cadence is wrong it will directly translate to incorrect power (power is basically cadence * force).
Maybe worth checking if you are on the latest firmware? (Load SRAM AXS bluetooth app and search for device).
Granted if it worked until this, and seems to have suddenly “failed” I wonder if new firmware could really even help…
Latest, though, is probably v10 back from 2019 - https://support.sram.com/hc/en-us/articles/4402065416603-Version-10-July-3-2019