Sounds like you have a problem with something grounding out or drawing too much current. I would check the TCCM and encoder motor connections for corrosion as this can cause the ATC fuse to blow. Corrosion could increase the resistance of the circuit causing it to draw more current, or it could bridge a power and ground together, shorting things out. This condition can be intermittent, but will eventually get worse.
This thread should help you in determining which contacts/wires do what:
NV236 Wiring Information