Hi
I’m no Shark expert but I know my Dysons like the back of my hand and I find when you can’t find the problem it tends to be a blockage from with in the cyclone (the bit that’s usually above where the dust collects)
You can do 1 of 2 things here
The best option is to completely disassemble the cyclone and hand clean all the parts with hot soapy water
The second option is Easier but doesn’t always work: if you can get a deep bucket and fill it up high and submerge the cyclone in the water and shake it up and down so all the water get is in a clean it ,leave it I. A warm room for a week to dry out
Hopefully this helps
If it doesn’t let me know and we can try something else
Thanks:-)