Are these brand new X55 units? When you reset, are you holding the recessed reset button for up to 10 seconds to fully initiate the reset? It's improbable all three would have the exact same failure...

@FanofD3C0 I experienced the same issue last night with my wired desktop PC. I previously had an X55 unit that worked perfectly but the BE63, even with new cables, drops my PC randomly then...