When I activate the self-testing on the ADXL355, I get an output of 0.313, 0.441 and 1.411 on the x-, y- and z-axis respectively. From my limited perspective, it seems that the y- and z-axis are deviating quite a bit from the specified 0.3 and 1.5. Are these values within the acceptable range or is it too much?
Another observation I have, is that sometimes I get a constant output. The issue is mitigated by performing a reset using the reset register. Is this normal behaviour?