dgs99 I have checked all connections.
If this is a 5V version of the ZWO EAF, try placing a powered USB hub in between the EAF and the computer. If it becomes stable, then the computer's USB port does not have enough power to keep the EAF alive. Be sure to test with a short and heavy USB cable. Do not use the flat USB cable that comes with ZWO products.
If the disconnects happen when it is cold, or continues to fail even through a powered hub and a good USB cable, then the EAF might need to be returned for replacement. Check with your dealer before the warranty runs out.
Chen