Good day @scart57,
Thank you for contacting Dyson Community.
I am sorry to hear about the power issue with your DC35™
We recommend completing the below troubleshooting steps.
Before your machine cuts out, does it make a pulsating sound like the one in this video?
Pulsating cordless machine
Cleaning your filters
If, after completing the above checks, the problem with your cordless machine is still present or your machine is not pulsating, please contact customer support to further troubleshoot the issue. Simply use the guides and manual link home the community homepage, choosing the ‘Support’ and ‘Contact Us’ option.
Thanks.