after upgrade to version 18 the thunderbolt external SSD wil disconnected many times

Dear Parallels

I have my virtual machines store on a external SSD connected to the USB-C(thunderbolt) on my Imac pro.
On this ssd i have the parallels VM and the Vmware VM on it.
After the update to version 18 the windows VM will stop working after a some times and give that the external SSD are disconnected and connect.
On vmware i have also windows 10 and there is no problem.
The SSD are not bad.

 

here screenshot, on startup the drive wil disconnect for very quick moment and connect