We've had a number of Dyson vacuums with the latter being a V11. Whilst it's been a very good vacuum the trigger stopped working which, upon reading various forums on the Internet, we found out, allegedly, it is a design fault by Dyson as there are many people complaining of the same problem.
Dyson say it can't be fixed but again the Internet proved otherwise with a trigger being bought for less than £5. I followed a YouTube video on how to replace it and within 45 minutes the vacuum is working again.
It's a shame Dyson are unwilling to say it was a design fault but hopefully they've improved the longevity of future triggers.