Futaba 7C throttle stick problem.

[Pyth0n]

My Futaba 7C is having some weird problem. When I pluged the throttle wont pass to 25% on the TH CURVE. It get 2 arrows one at point one and other at point 2.

First I thought it was a potentiometer problem, that something burned out.
Removed the battery let it without the battery for a coupple of minutes and them turned back on.
The TH CURVE now was working fine u could see the potentiometer wasnt the problem and how the radio was reading the signal from it.

Turned the radio off and turned my RX on and them the TX again. The problem simply appeared again.

Anyone have any tips? It happened from nowhere.