To come to find out if you tapped the back it would cause all kinds of h*ll. I checked the transmitter with the module from the other tansmitter and everything was fine. I called Hitec this morning and told them the problem and they told me I needed to send in the Transmitter with the module because they have to change the back case.
There might be a minor technical issue with the Optic 6 that I haven't read about yet. I have been using one for two years now. It includes the Spectra Module. I have noticed on occasion during ground checks that tapping the module on the back of the transmitter caused intermittent radio glitches. The cause turned out to be loose contact on the pins that connect to the Spectra module. Cleaning the pins and just slightly bending them toward the top of the radio increased the contact in the module, and the problem went away. This may be the modification that Hitec is making to the back of the case. I have been alert to this possibility, and include it in my ground checks each day, and the problem has not resurfaced.
Brad