Motors disarm immediately after landing

My motors have started to disarm immediately/instantly as soon as I land and pull the throttle stick to idle. INSTANTLY.. This has just started (well actually it started when one and only one of my ESC's started to continuously beep when plugged into Mission Planner). I have another post about that issue. Anyway, I have calibrated the motors/ESC's  numerous times-no help.

DJI 30amp opto ESC's

APM 2.5 with 2.9.1 FW

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  • There is just something totally wacky going on now. After the ump-teenth time of radio calibration and ESC calibration something new has cropped up. With me holding the model down (props on) at about 1/4 throttle stick, 2 motors on opposite diagonals just stop spinning. I can pull the throttle down to near idle and then back up to 1/4 position and all 4 spin again. All of my problems started when I loaded 2.9.1 so I want to go back one version. When I pick  a previous version in Mission Planner the drop down menu only shows several lines of some kind of code. How can I pick 2.9 from that list?

    I have already checked all of the connections... the battery is charged, etc...

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