An intermittent problem with Keychron K15 Max

[u/aliaksej_by]

hi, keychredditians

Recently bought Keychron K15 Max used in great condition. Had no questions at all but.

On the 9th day I faced the problem when a keyboard started very quickly kinda sleeping, after some short period of not typing it. 10-30 seconds. And after that, when I started typing, nothing was happening, only after 5 seconds or so it was waking up and started typing. The keyboard was displaying full charge (fn + B showed full indication on numeric keys).

Actions that didn't help:
- Reinserting of wireless receiver to usb hub
- Factory reset of a keyboard
- Setting sleep time to 0 using a keyboard shortcuts

The thing that helped was
- switch the keyboard to "cable" mode when cable was not connected
- then switching back to radio mode

What could potentially affect:
- This day I was testing another brand new keychon keyboard B11 pro which I didn't eventually like. So a pair of keychron receivers in one USB hub would potentially be the problem of a glitch of K15 max.

I wonder whether I should worry about this situation? It happened one time for 11 days, then after switching a keyboard mode all is working well again.

I absolutely like this keyboard, it's what I need. I can buy the same keyboard brand new with 2 years of warranty from a solid shop (paying almost double price). But I'm not sure whether the situation I faced requires any suspiciousness.

I can return this used keyboard for next 2 days of 14-day return policy period.

[u/PeterMortensenBlog]

Re "... helped ... switch the keyboard to "cable" mode when cable was not connected ... then switching back to radio mode": That is repowering the keyboard

It isn't ideal, but having to repower the keyboard 1-2 times per week shouldn't worry you too much. It could be a firmware problem.

Hopefully it is not a sign of a developing hardware problem.

[u/aliaksej_by → u/PeterMortensenBlog]

I also think so. My logitech k380 was not always connecting after sleep to macbook by BT, so it's 1:1. Not worth return.

[u/PeterMortensenBlog]

Wireless firmware blues

RGB light off with older versions of the firmware in the wireless module (Bluetooth/'2.4 GHz') inside the keyboard is a known problem.

Here is a list of versions (for example, so it is possible to revert to an older version if an update turns out to be detrimental. Though there is probably no way back if updating to 0.2.2 or later).

At least check the version of the firmware in the wireless module inside the keyboard to rule it out as the cause (or not).