Appliance Repair Questions? Ask a Technician for Answers ASAP
Hi - Welcome to JustAnswer I’m Paddy and I will be your technician
It is normal for the blue light to do this as it will replace the charge used during vacuuming - Do you have any performance issues while using your Dyson?
Hi - if you have a blue light while charging which goes out when charged and you do not have any red lights suggests there are no electrical issues.
The motor stopping after a short period can be due to a safety feature to prevent the motor from overheating & indicates there is something restricting the airflow, remove the dust bin and pull the trigger if the motor doesn't stop this indicates there is a build of debris in the vacuum between the brush head & the dust bin, check the following:
See attached photo to help identify the above.
After checking for blockages and the problem persists then it could be the battery. Batteries degrade over time and you have owned your Dyson for four years.
Replacement batteries can be purchased direct from Dyson or compatible versions can be found with online retailers, they are easy to replace (one screw to the front or the battery, one screw to back of the trigger handle).
I hope this helps.