This has been reported by @dstoychev by email:
No idea if it is something related to the firmware or the drivers, so it may be device specific quirk, but every 131st pattern needs to be duplicated in the queue of patterns. If I remember correctly, without this duplication every 131st pattern is effectively skipped.
He has fixed it on his fork of microscope in dstoychev/microscope@5a297ff
This has been reported by @dstoychev by email:
He has fixed it on his fork of microscope in dstoychev/microscope@5a297ff