There are a bunch of reason for the various things that are happening.
A few questions. Do you have the motor leads choked? If so, what are you using for the chokes, and how many turns?
Where and how is the antenna mounted?
One reason the could be 7000 is shutting down is voltage. If it drops below 11.7 or so, it will shut down. It could also be caused by too much common mode currents on the coax and control leads, hence the previous questions.
There is more to be sure. You might want to look over my web site for answers. Start with Automatic Controllers.
A photo of the install would help too, and my e-mail address in on the site.