OneDrive File Issues

How to Fix OneDrive Wi-Fi Sync Problems for Large Files

Maira Mehtab Oct 9, 2026 870 views

Question details

The user is unable to upload files larger than a few hundred kilobytes to OneDrive over a Wi-Fi connection, whereas wired Ethernet connections work perfectly.

How to Fix OneDrive Wi-Fi Sync Problems for Large Files

Product: OneDrive
Device & OS: not provided
Scenario: Uploading large files to OneDrive while connected to a wireless network.
Observed behavior: OneDrive synchronization hangs or stops completely for files over a few hundred kilobytes on Wi-Fi, but resumes normally as soon as a wired connection is used.

Before you start

Ensure you have administrator access to your computer, as you will need to view running processes and potentially modify network software settings.

Solution 1Recommended

End or Uninstall Network Optimization Software

Network optimization applications designed for gaming or streaming can mistakenly throttle or block OneDrive's background upload traffic over Wi-Fi.

Programs like Killer Apps (KAPS.EXE) manage network traffic to prioritize low-latency tasks such as gaming. However, their traffic-filtering protocols often interfere with background cloud synchronization services like OneDrive, causing large file uploads to hang.

Open Task Manager

Press Ctrl + Shift + Esc on your keyboard to open the Windows Task Manager.

Locate the interfering process

Scroll through the 'Processes' tab and look for 'Killer Network Optimization Service' or 'KAPS.EXE'.

End the task

Right-click on the process and select 'End task'. Check if your OneDrive upload resumes immediately.

Uninstall the application (Optional)

If this solves the issue permanently, consider going to Control Panel > Programs and Features, and uninstalling the Killer Apps software to prevent future conflicts.

Synchronization Restored: Ending the network optimization process immediately clears the blocked traffic route, allowing OneDrive to finish uploading large files over Wi-Fi.

Solution 2

Temporarily Disable VPNs and Security Firewalls

VPNs or strict third-party firewall rules might block the specific ports or routing paths OneDrive requires over a wireless network.

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Frequently Asked Questions

Why does OneDrive upload large files on a wired connection but hang on Wi-Fi?

Certain network optimization programs, often bundled specifically with Wi-Fi adapters (like Killer Apps), prioritize gaming and streaming traffic over wireless connections. They can mistakenly throttle or completely block sustained background uploads like OneDrive.

What is KAPS.EXE and is it safe to disable it?

KAPS.EXE stands for Killer Network Optimization Service. It is a legitimate traffic-management tool, but if you are experiencing network drops or cloud sync issues over Wi-Fi, it is completely safe to disable or uninstall it. Your computer will simply use standard Windows network routing instead.

Will changing my DNS or router settings fix OneDrive upload limits over Wi-Fi?

Typically not for this specific issue. If uploads work fine on a wired connection, the problem is almost certainly caused by local software on your device (such as firewalls, VPNs, or traffic optimizers) rather than your physical router, mesh configuration, or DNS provider.

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