I had the same issue happen with 2 Apex Pro (the ones with the FMM module included). It happened over a period of 2 years, so completely different batches. It sounds like much of Neptune equipment, it is held together by the proverbial 'paperclips'. You look at it wrong and it fails. I decided that the pro unit (around $300.00 more, depending on the bundle you choose) just is not worth it. You are better off with a simple Apex and buy a separate FMM module.