This is a known problem and I already asked for a firmware update two times at Elektron support. The A4 suffers from the same problem. It doesn’t respond well to external swing and if you swing it to much the sequencer stops playing. It has something to do with the way it responds to clock pulses. The Octatrack wouldn’t even sync, but that’s solved now as I requested this to be fixed. They had close contact with the company behind the ACME and fixed it in an update. I asked for the same kind of fix for the A4 and the Rytm, but as of yet no luck. The Machinedrum works fine BTW.
PS. The Roland TR-8 wouldn’t react to swing and keep a steady beat. probably to correct sloppy midi timing (not a bad idea actually). But in a recent update they changed this behavior and now it does react to external swing (and you can use it’s own swing also, so a lot of fun to mix different swing patterns.
try to reduce the pulses in the settings. i’m not in front but i think 14 is standart…try 9-11 or so…or put swingpot to max and reduce the pulses until its not dropping out…also enable mpc-mode and see if it helps.