I was going to suggest unchecking the “Allow the computer to turn off this device to save power” option in device manager but I see you have already tried that. Another suggestion is to pickup a powered USB hub and just have the mouse plugged into that. I linked the first one I could find on newegg…cheaper ones can be found.
Newegg.com - BELKIN F5U237-APL-S Hi-Speed USB 2.0 7-Port Hub
I know this doesn’t help but I’ve always had a problem with Razor mice which is unfortunate cause I really like them! I have an older Copperhead that behaved exactly in Win XP. It was like the USB port just shut down. Unplugging then re plugging in the mouse would get it working again. Fortunately it didn’t happen that much. I tried a Naga mouse in a Win 7 machine and all I got was BSOD! In fact the pc wouldn’t even boot with the mouse plugged in. I just returned it.
I can see Razor has a firmware update for the DeathAdder 3500. Have you tried that? Also make sure you have the latest drivers for your OS.