This is not a malfunction, rather it is expected behavior. The gateman adds substantial additional load to your transformer/ track circuit. Since current (amperage) is proportional to voltage, available voltage is reduced as amp load increases (for a given voltage output) and the train slows down.
If this were a 145 wired traditionally, the easiest fix (beyond simply raising the voltage as needed) would be to put the gateman on a separate circuit utilizing either a common ground insulated rail or an isolated contactor like the 145C or newer 153IR. This would separate the track circuit from the gateman load. I am not familiar enough with the newer PnP system to know if any iteration of this wiring scheme is possible.
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