The brush head chatters against my teeth.
Brushing seems less powerful.
This can be avoided by keeping the brush head properly oriented, with the brush head placed on the gumline at an angle of 30 to 40 degrees.
The handle may need recharging.
The Easy-start feature may be on and needs to be shut off (see chapter “Using the appliance”)
You may need to clean your brush head. You may need to replace your brush head.