Tom, I believe that we tried to get in touch. We've released several updates for firmware, drivers, and MaxIm. Camera firmware is now at v22: https://diffractionlimited.com/aluma-fpga-firmware/ MaxIm is at 6.27 - in MaxIm, Help, Check for Updates DL Imaging drivers are now at version 2.0.2.0: https://diffractionlimited.com/down/SetupDLAPI.exe And the ASCOM drivers (in case you need them): https://diffractionlimited.com/down/DLImagingASCOMDriverInstaller.exe These should be updated as a set - versions can't be mismatched. @Adam Robichaud may wish to chime in.
I updated Maxim and the drivers and firmware. I tested the camera/filter wheel over three separate nights without any duplication of the problem. I consider this closed.