I’m seeing this a ton today and it’s causing some major issues in long running workflows. Effort becomes shallow and tasks stop suddenly with no warning and a small hard to read message in a giant wall of text for a session that has been running for hours.
I have had to go back and correct major issues multiple times in the last 24 hours due to these effects. GPT 5.5 xHigh, Codex Desktop MacOS and Windows desktop both.