Replace the failing cable, hub, or port path
Use the two-way test to replace only the component the fault follows.
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Find whether repeated Windows USB mouse disconnects come from the cable, port, hub, power, driver, or mouse hardware.
A disconnect that follows the mouse to another PC points to its cable or electronics; one that stays with a single port points to the host USB path.
Use a rear motherboard USB port on a desktop or a direct laptop port. Avoid adapters for the first test.
Test the mouse on another PC and a known-good mouse on the original port.
Without sharply bending it, observe whether gentle cable movement near either connector triggers the disconnect.
Install Windows updates and the PC maker’s chipset/USB driver. Avoid generic driver-updater software.
Only for idle-related failures, record and temporarily change the relevant device power setting, then restore it after the comparison.
Use the two-way test to replace only the component the fault follows.
Unplug the mouse, uninstall only its affected HID/device instance, restart, and reconnect it.
Keep a working keyboard or alternate pointer available and do not remove every USB controller at once.
No. Microsoft recommends leaving selective suspend enabled. Use power changes only as a bounded diagnostic when failures are idle-related.
Microsoft Support. Direct-port, battery, cable, hub-bypass, driver, and cross-PC diagnostic order.
Microsoft Learn. How HID idle and wake power states work.
Super User. Symptom evidence and device re-enumeration as a bounded repair.