I have been previously using the Envisalink Integration successfully for three years with a DSC panel. However, in the last several months, Hubitat (C-7) seems to get overload message (example of one of the sensors is attached below):
The first thing I would be sure that the device is reporting legitimate events. Looking at the spacing of the events they do look rather close together for a motion sensor.
I'd take a look at you Logs\Device Stats and see how busy the device really is.
But if it is legit you could modify the alert threshold which eliminates the error but does nothing about the hub load.