Is it colder? ACP is at the top of the food chain on this. Under ACP is the mount control software/ASCOM Driver and that is what is responsible for talking to the mount. ACP never connects to a mount. However if the mount throws an error it will stop and disconnect. Do you have a dome or roof? A communication error coming from the dome/roof controller will also cause ACP to drop the connection. Is the Hyperion a dome control or telescope control or both? Is this what you are using ? If so this is where the problems are coming from.

These three lines in your logs are really telling you the truth, really:

02:11:11 [Source: ASCOM.HyperionServer.CP210X]
02:11:12 [Communication Failure]
02:11:12 [This is not an ACP problem]