Audio cutting off

Hi all, I'm currently making a patch that plays generative music that create colours with their parameters. Everything works fine at the minute (only the kick, hi hat and synthesiser 2 sub patches are complete at the moment), however the audio cuts off after a short while and then attempting to change the audio set up crashes Max. I think it may be a CPU issue (not enough to cope with the patch) but I wondered if it could be anything else. The kick sound also creates some unwanted noise when it hits at the same time as one of the notes from synthesiser 2. Any help is massively appreciated!