There are some Watchdog oddities related to the Driver station that National Instruments is working on.
See the
Watchdog thread and post what you see happening with the Watchdog there. NI is more likely to see it.
An error 44015 means there's an error or typo in one of the RefNum's you are using. The ones when you Open a device in Begin.vi and then later use in in Teleop.vi.