IBUS telemetry enabled discconects fs-ia6b

[theramman]

When using ibus telemetry with a fs-ia6b the RX will disconnect after a short period of time. If using a fs-ia10b it will not disconnect. Have noticed this on various FCs.

Bug report

Issue details

Please describe the problem

Version
What version was the issue encountered with

Platform
[ ] All
[ ] AntennaTracker
[ x ] Copter
[ ] Plane
[ ] Rover
[ ] Submarine

Airframe type
What type of airframe (flying wing, glider, hex, Y6, octa etc)
Heli

Hardware type
What autopilot hardware was used? (Pixhawk, Cube, Pixracer, Navio2, etc)
mini-pix, AtomRCF405
Logs
Please provide a link to any relevant logs that show the issue