I have two MP40QDs installed on a 65 gal system controlled via an Apex Classic/WXM, Whenever I remove/replace the wet side of the pump on left side of my tank for cleaning or whatever, it almost always disconnects from the motor the following evening and falls to the bottom, doing so exactly at 7:20 PM each night, which is in the middle of a Nutrient Transport Mode (running from 6 PM to 8:30 PM) at 25% power. I replace it, and it works fine for 24 hours. When I replace the wet side I always center it as best as possible and there is never any noise or vibration from the pump, however just before it falls the motor makes a loud, awful [vibrating] noise and the wet side falls to the bottom. In the past, eventually after a couple of days the wet side will stop falling and it runs fine (without noise or vibration) until the next time I remove it for cleaning and then replace it. I just cleaned this pump last week, and right now it's six nights in a row that the wet side has disconnected in the described fashion exactly at 7:20 PM each night. The other pump has worked just fine without issue. It's very odd and frustrating. All Ecotech had to offer was to add a transition period because the change might be too drastic and use a thinner spacer. I'm already using the thin spacer on a 3/8" plex tank. And, I don't know how adding a transition period would help as it happens in the middle of a 2-1/2 hr NTM period, plus the other pump has always worked just fine w/o similar issue. Need suggestions to help me sort it out.
Thanks,
Jace K.
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