vacuum cleaner works on-off

Situation: 2 years old V6; canister is empty and clean ; the motor filter is clean. the MAX button is OFF. All is OK with the cleaner. BUT:

After a full charge, motor kicks out after 2 minutes of operation- put on charge again for one minute- motor starts again for an other minute- put on charge few more minutes- vacuum cleaner OK for ONE minute; and so forth. Could the life of battery has ended?

Note: on the body, the light is solid blue when in operation and flashing every time the cleaner stops.