1
Diagnostic step 1
Reduce RF interference: route the USB cable away from laptop Bluetooth antenna area, use a shorter/older cable or a shielded USB 3.0 cable, and test whether that removes duplicates
FULL AI ANALYSIS
Windows 11: Bluetooth keyboard sends duplicated characters only while a bus-powered USB 3.0 external SSD is connected to the same hub
Generated Oct 3, 2026, 12:35:03 AM
Analysis summary
Symptoms match known USB 3.x radio interference and host resource contention scenarios: high-speed USB 3.0 transmissions can generate broadband radio noise in the 2.4 GHz range interfering with Bluetooth, especially when antennas are close to USB 3.0 ports or cables lack shielding. Another contributing factor is the Bluetooth adapter sharing the same internal USB controller or power budget with the external drive, leading to timing jitter and packet retransmits at the HID level causing duplicates or missed keystrokes. Differences between enclosures and ports support an RF/shielding or power-draw explanation. The partial improvement when disabling power-saving indicates a timing/latency element as well.
Possible causes
Poor shielding or defective enclosure/cable generating radio noise specifically when heavy writes occur
90%USB 3.0 electromagnetic interference (EMI) from the enclosure or cable affecting Bluetooth 2.4GHz radio reception
75%Host USB controller resource contention or USB hub internal routing—Bluetooth adapter and SSD share the same USB root hub causing latency spikes
50%Insufficient power delivery on bus-powered enclosure causing voltage droops and transient behavior affecting USB controller/bus timing
30%Suggested fixes
2
Diagnostic step 2
Change physical ports: plug the SSD into a port on the opposite side of the laptop or into a powered USB hub to separate power and reduce EMI; test if issue goes away
3
Diagnostic step 3
Use a powered USB hub (with its own external power supply) for the NVMe enclosure so the bus-powered draw no longer stresses the laptop's USB power rail
4
Diagnostic step 4
Move the Bluetooth adapter away from the hub: if using an external USB Bluetooth dongle, plug it into a short USB extension and position it away from the SSD cable; or pair the keyboard via Bluetooth LE (if supported) which can be more resilient
5
Diagnostic step 5
As a software workaround, increase keyboard repeat delay in Windows Settings → Typing to reduce impact of duplicate events, and keep BIOS/firmware up to date for laptop (may include USB controller fixes) — if hardware interference suspected and mitigations fail, replace cable or enclosure with a better-shielded model or escalate to hardware/vendor support for enclosure replacement or warranty testing