Suddenly, Jenkins is taking a massive amount of time when reaching the "DOM event pageshow" (after "DOM event DOMContentLoaded")

My test job in the past was taking something like 15 minutes, now it takes 4 hours!
No changes were done on the tested code .
Tests have running for a long period of time without any problem

I'm using Selenium, Geckodriver 0.24, Firefox 60, RedHat 6.5

In attachment I'm sending a thread dump,  and a screenshot of logs, whilst running the problematic "DOM event pageshow"

I din't find any memory problems (using top, free, etc)

Any help would be welcome

Cheers