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Diagnosing an Unusual WiFi Issue (2020)
Late last year, I started experiencing some unusual intermittent connection issues on my Desktop. In general, I had a stable connection with average latency; however, at (seemingly) random times throughout the week, I would start experiencing sudden 2000ms+ latency spikes every couple of seconds.
At the exact same time the lag spikes occur, MBPP starts querying the registry keys for all of you network interfaces. To dig a bit deeper into why this is happening, we can attach to the process with a debugger (x64dbg here), and set breakpoints on the Win32 Reg* APIs. If I understand correctly, any Qt5 (<5.14) application using QNetworkAccessManager will check for wifi interface changes every 10 seconds for the purpose of bearer management, causing massive lag spikes and/or packet drops entirely.
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