A4Tech KV-300H - unstable connection


New member
AMD OS X Member
Jun 7, 2020
Hi! I'm using A4Tech KV-300H keyboard for years. A few days ago bought new, updated version with Fn keys. It's absolutely the same A4Tech KV-300H version, but one right Windows button replaced with Fn key.

And this new version is VERY unstable. It randomly does not work and requires re-connection on random usb ports to work. It may stop working after a minute or after a few hours.

Moreover, when connected to any usb port, it appears instantly in IORegistryExplorer, but it can work or not.

All my motherboard usb ports are mapped via USB-Map.kext.

Anybody have such problems?

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