I have confirm 2x TX 2.4ghz Dsss module for M11 malfunction as it unable to bind: 1 from original Sanwa and 1 from Airtronics 93724. Previously both TX module runs well for a month then after rebinding it failed. However when i use my friend's TX module it works.

So my question is how possible a TX module malfunction...wirelessly???? I couldn't even google for solution. How can i reset the binding on TX module manually? However all the receiver RX module works well. I need a lead here.