Worx 373.2 drill sometimes wont work ,switch cleaning,

Worx wx373.2 .3 years old...about 1 month after warranty expired drill wont spin ,led light flashing,firstly i cleaned with air compressor but it didnt help,then i disassembled and cleaned switch with contact cleaner/ buy better than mine -COMMA brand is really not good as its leaking under white button when you press it/ .after cleaning drill working as new one.