My account logging out all the time

Hi,

I’m having a problem. All the time that you click on any page inside My Accont it keeps logging out. It’s a real problem for my customers, they are not able to make a purchase in a clean way, it takes several attempts.

See the problem here:
https://wavesfactory.s3.amazonaws.com/login.gif

Does anyone know what’s going on?

Thanks,
Jesús