Unreliable pattern changes M:C/M:S?

Hi, I am noticing some unreliable behaviour when trying to sync pattern changes between Samples (master) and Cycles (slave).

The program change channels on both devices are on 16. They are connected through a trs cable.

When I open a new project on both machines, I can switch perfectly between the empty patterns while they stay in sync. But when I start to build patterns, I notice that the behaviour changes. When I change a pattern on the Samples, sometimes the pattern change on the Cycles is 16 steps too late, sometimes it stays perfectly in sync.

Anyone familiar with this?

Have you checked this :

9.11 SCALE MENU

In this menu you can set the length and timing of the pattern and tracks. Press [FUNC] + [PAGE] to access the SCALE menu. Use LEVEL/DATA to browse and change the settings.

MOD Mode can be set to either PATTERN or TRACK. In PATTERN mode all tracks share the same SCALE and LENGTH settings. In TRACK mode, all tracks can have individual SCALE and LENGTH settings. Press [T1–6] to select the track to set the scale for.

LEN Length sets the step length (amount of steps) of the pattern/track.
SCL Scale controls the speed the playback in multiples of the current tempo. It offers seven possible settings, 1/8X, 1/4X, 1/2X, 3/4X, 1X, 3/2X and 2X. A setting of 1/8X plays back the pattern at one-eighth of the set tempo. 3/4X plays the pattern back at three-quarters of the tempo; 3/2X plays back the pattern twice as fast as the 3/4X setting. 2X makes the pattern play at twice the BPM.

CHG Change controls for how long the active pattern plays before it loops or a cued (the next selected) pattern begins to play. If CHG is set to 64, the pattern behaves like a pattern consisting of 64 steps regarding cueing and chaining. If CHG is set to OFF, the default change length is INF (infinite) in TRACK mode and the same value as LEN in PATTERN mode.

Trigs are automatically copied when extending the length of a pattern. If a pattern consists of, for example, two pages and the pattern length is increased to four pages, and the two additional pattern pages are copies of the first two pattern pages.

Thx. Yeah, I am aware of the settings in the scale menu. All of them (in all patterns and on all tracks) are set to either trk or ptn and the default settings
(mod: trk or ptn, length: 16, scale: 1x, chg 16)

Tried messing around with a bunch of settings, but to no avail. I wrestled with this before, using the DT/DN combo. I forgot if I ever found a solution there.

I think I figured it out: when all settings in the scale menu are the same on both devices and I change PTN to TRK on one of them, the syncing starts to get unreliable.

Is this a bug or expected behaviour? (In other words: am I missing some kind of logic?)

Just changing PTN to TRK shouldn’t make any difference. Are you altering the speed of one of them? Sct?

Nope, all the same. Although I can’t rule out I changed them while building the patterns, but now they are all back to the default.