cRIO Watchdog FPGA error-63195

[fishy LOTP]

When running code on the cRIO we get the following errors:

63195 occurred at Read/Write Control in FPGA_WatchDogEnabled.vi->FPGA_WatchDogWriteEnabled.vi->WPI_WatchdogOpen.vi->Begin.vi->Robot Main.vi
NI-RIO: (Hex 0xFFFF0925) The handle for device communication is invalid or has been closed. Restart the application.

We also get FPGA errors when initializing encoders in begin. The watchdog still works(well enough for us to move motors smoothly) but the encoders don't. We're using the small cRIO. From what I've read I believe the issue is something between the Digital Sidecar and the cRIO.

So far we've tried:
This advice from NI
Reimaging the cRIO
Reinstalling Labview
Swapping out the sidecar
Swapping out the ribbon cable

None of which has worked so far. We'd love to get this fixed so we can use our nice encoders. Somebody help please?