Attapoll Error 400 everytime

I've been using Attapoll for a year, it's been good until the last weeks as I cant do almost every single survey because of a certain "error 400 BAD REQUEST, Request headers size too big".

I used to get this error before but it wasn't that frequent that I couldn't do any survey, now it comes almost everytime I try to do one, it's absurd.

Has anyone had this issue before? what does ERROR 400 REQUEST HEADERS SIZE TOO BIG even mean? Does anyone know how to fix this?