Problems with Death Adder Elite and Windows 10

A couple of days ago my death Adder Elite starting acting very erratic, i.e., the cursor was jumping all over the screen. I have an older back up Elite and plugged it in: same problem. I tried all the USB ports front and rear: same problem. Mice worked flawlessly on Windows 7 before I upgraded to 10. The only way I could fix both mice was to uninstall the Razer software and go into the M/S mouse settings in the control panel. I had to move the slider more towards slow and also uncheck "enhanced pointer precision". Has anyone else had this happen with the Elite (or any other Razer mouse) in Windows 10? The MB is an Asus P8P67 Pro and is about 8 years old so it might be possible it is starting to act up. I've run all the usual thorough checks on the OS (SFC, DISM, Chkdsk, A/V and Malware scans, etc.) with no problems found. Any suggestions I might not have thought of? Maybe a software conflict?