It's normal for XIM to flash white when making a change and saving configs. If it becomes stuck and is solid white this is a freeze caused by either corrupt configs or an attached device. Unplug and replug XIM with everything disconnected from XIM and there is no white light this is caused by something in your setup. If the white light remains when started this way a factory reset is needed.
Thanks for the suggestion. I have completed a factory reset, I should know more later today. Fingers Crossed
If your mouse continues to work but your keyboard disconnects this could indicate an issue with the keyboard. Testing the keyboard in another port or testing another keyboard would be helpful.
I thought this as well. I had a second keyboard NIB same model and it still froze. I think it had more to do with the configs. I hope. The worrisome part was the device would respond to new configs and seemingly save them but an hour later upon reboot the config was nowhere to be found in the apex.
About your fortnite switch issue, check the fortnite hotkey and the config cycle keys in menu-global settings. Both of these could be responsible for the config switch. To prevent accidental activation the fortnite hotkey should not be a commonly used key. I use F1-F12 for example to avoid this issue.
I deleted fortnite (and all other configs with reset). I haven't played since they added the hop rocks.
Thanks for the insight and suggestions. I will report back, hopefully with success.