Same issues here,
i thought it would be a better workflow, when the wait-to-load- pattern feature were implemented, but thats not the case.
Especially the waittoloadpattern feature in conjunction with the PRST LNK button activated leads to complete untight pattern changes, because the "leading" SEQ is not the SEQ on which the next pattern is switched per button, nope itīs always the DRM SEQ thats determining the change point.
So i gone back to change all 3 SEQ manually and press the buttons simultaneous which means that every SEQ has itīs own change point.
BUT! Even then errors occuring like the one you described; some patterns change at the end, but the following pattern starts SOMEWHERE.
So i tried to change the pattern attributes to same lenght, same speed, same count... no change.
Itīs simply a buggy firmware.
since the beginning.
And everytime they fix one bug, there will be 3 new ones.
For the future i will be very careful to have a try on a new arturia product.
some major faith is gone here...