I have a K3s. I only use CW. I only use a Bug. Speed about 26-28 wpm. I have the K3s set on "non-QSK", but the interval is short.
I got the following Report
"When it happens it is always after you send a string of characters and pause for a few seconds. When you start xmitting again your freq will shift ever so slightly, like maybe 5 Hz or so. It will hold that freq until another long pause the back to the original freq. Back and forth just every once in awhile then sometimes not at all. "
The change when I pause may be due to the non-QSK timing out.
Anyone have any similar experiences and/or comments