We have a large mailing list (120,000 subscribers) which runs on AutoResponsePlus. Recently we have had problems with mailings pausing frequently, plus a few system crashes and other errors.
The problem seems to be with the underlying MySQL setup. We need someone with in-depth MySQL expertise to investigate the issue and fix the problem.
The problem should be resolved so that mailings run smoothly and efficiently (a broadcast should take around three hours), and other admin functions also work as they should.