Ultra dual usb 3.0 write speeds drop drastically after ~10 seconds

Well I’m gonna return this thing, I have usb2.0 drives that are this fast and Sandisk tech support just pulled the “well this drive doesn’t have an advertised write speed, so there’s nothing wrong”.

Not sure what happened to Sandisk, but this is the second product in the last few years I have bought from them that performed way below expectations.