HTC Vive Base Stations Missing

When I play our game on HTC Vive, one of my base stations will missing usually. And wait for along time, it may come back. But when I play other games on SteamVR, Either of the two base stations works well.
Is there something wrong in my game logical?
Can I do anything to keep base station right there and works well in Unreal?
Thanks for any help.