Maxim stops in plan

[Mike Shade]

Ran last night-the same plan that has run the previous two nights, without issue. ACP had the following for me this morning (from log)

04:07:03 Updating pointing...
04:07:03 (taking 10 sec. exposure, lum filter, binning = 2)
04:07:03 (using High Gain StackPro readout mode)
04:09:56 **Script Error (Tracking has been stopped)**
04:09:58 Source: MaxIm.CCDCamera
04:09:58 Message: **Failed to start the exposure
04:09:58 Location: line 1533 column 33.

So this is new behavior. W10 pro system/Maxim 6.28/ACP 8.3/Focusmax 5.1.0.12/Aluma AC4040 camera/SC3 guider/FW7STX filter wheel

I know there is a problem with the driver for this camera when it is binned 2x2 (according to D Limited), something about overflow so can't bin the color frames-they need to be 1x1. Also not sure if this could be something related to the readout mode, High Gain Stackpro. Log attached.