Ok people, this is the stupidest thing ever for Linux. All of a sudden my usb3 flash disks made a connection and then disconnected. I searched and searched and found this was happening all the time. Every time they put in a new kernel. As usual, the answer is to do million things and suddenly it works.
For me, the final thing was the grub configuration. You change /etc/default grub file and then you run update-grub to nail it in.
GRUB_CMDLINE_LINUX_DEFAULT="usbcore.autosuspend=-1 iommu=soft quiet"
The final thing was the autosuspend bit. I had changed iommu and turned off the iommu in the motherboard but that didn't do anything. Now the usb3 mounts up like any other flash disk. Yeah! :)
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