It seems I found reason why the HEQ5 randomly stops tracking. It seems that the EQMOD driver is loaded with the option to stop tracking when the horizon is on its limits. When I unmark this option the HEQ5 tracks without a problem. I was logging the mount and I found following records at the moment the tracking stopped :

2019-02-16T09:37:47: [INFO] Setting Backlash compensation - RA=10 microsteps DE=10 microsteps
2019-02-16T09:37:47: [INFO] updateLocation: long = 4.72417 lat = 50.8297
2019-02-16T09:37:47: [INFO] Loading device configuration...
2019-02-16T09:37:47: [WARNING] Can not load HorizonLimits Data File ~/.indi/HorizonData.txt: No such file or directory
2019-02-16T09:37:47: [INFO] updateLocation: long = 0 lat = 0
2019-02-16T09:37:47: [INFO] Mount is parked.

kind regards,
Gunther

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