Linux Mint 19 Cinnamon, 64 bit.
Recently my Microsoft Wireless Multimedia Keyboard 1.1 has stopped working, well not completely.
Sometimes it'll work, it'll only work for about 20 seconds and then stop again.
I've changed the batteries (twice) and it makes no difference.
I never, ever had this problem with Mint 18.3 and even early on in Mint 19 it was working fine but in the last few days it's all gone wrong, I have looked in the Update Manager and there was a keyboard configuration update, could that have done something?
I have installed the microcode updates today and restarted but it's made no difference. It could be just that the keyboard is on its way out but I just don't think so.

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steve@steve:~$ lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 0bc2:3300 Seagate RSS LLC
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 003: ID 045e:009d Microsoft Corp. Wireless Optical Desktop 3.0
Bus 005 Device 008: ID 1d57:ad17 Xenta
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 1a2c:0c21 China Resource Semico Co., Ltd
Bus 004 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
steve@steve:~$