My lexar 64gb usb stick just downgraded itself to usb2.0 speeds :(

[seccentral2]

Hello, I have a lexar 64gb usb 3.0 drive that worked well for a year almost, reading with almost 400MB/s and writing with about 250MB/s on average.
Yesterday it just downgraded to usb2.0 speeds and reads/writes with 40MB/s .
I tried format i tested in 3 different pcs with windows with linux, no change.
Windows tells me "this device could perform faster if plugged into a usb 3.0 port" and i'm like You don't say ? I've been using it for a year i know for sure it's in a usb 3.0 port.
What can i do to make it work at usb 3.0 speeds again ? can it be a hardware problem ? I'm pretty tech savy and don't mind reflashing it's firmware it's just that i have no experience dealing with this particular type of problem.

 

[CountMike]

One of contacts that make them USB3 may be damaged. If you look at connection schematic of USB2 and 3 you can see difference in connector numbers.

 

[seccentral2]

One of contacts that make them USB3 may be damaged. If you look at connection schematic of USB2 and 3 you can see difference in connector numbers.

I just looked up schematics online. they and the actual connector in the thumb drive look pretty much the same. ie nothing bent, broken, nothing. just the usual usage marks . this is really frustrating.