Minibox continues to indicate reboot required for update

One of our TVs has an issue where the minibox recycles every few minutes indicating reboot required.  When select is chosen on remote tthe TV resumes and the cycle continues.  The box was replaced and the issue continues.  There is a spltter in the house and a signal booster on this TV and one other that had pixilation problems.

All other TVs work without issue.

I am not willing to pay a service call as this issue was initiated AFTER we were forced to use miniboxes.  What is the solution?