I'm constantly getting signed out on the PoE Homepage

I have this problem quite a while now. I can't even log in again after i've got signed out (i can, more or less, but a reload of the site, or a redirection to another part -> signed out again).

I have to delete the cookies and website Data first before a login works for a few hours again.

I use Firefox. I disabled the Firefox privacy protection for pathofexile.com completlty. I've also deactivated my Adblock completly here.

Anyone else has this problem? Are there any solutions for this?

It's really annoying because if i'm not loged in, my live active searches stop working...