Randomly when I plug in headphones to my remote, it will lock up the roku ultra unit and force it to reboot (happens automatically, I don't manually reboot). It doesn't happen all the time, but when it does, it usually will take three to four reboot cycles before the remote finally accepts or works with the headphones.
I have updated the unit to the current latest version (v11.50.0, build 4312), I have replaced the batteries.