I have an ender 3, running the stock firmware (latest as of now), and my BLtouch just started having problems. It will do the self test (cycles in and out twice) on startup, then stop responding. I cant self test or deploy it from the control menu, nor does it deploy when I try to print. Nothing I can see has changed since the last successful print and the start of this issue. I have made no changes to any software or settings either on the printer or my slicer. I have inspected the wiring to the probe and there is no damage, all connectors are fitted tight. If it just stopped working entirely I would suspect either a connection or the probe itself, but it still does the startup test just fine which rules that out.

I am at a loss as to next steps to diagnose this and welcome any suggestions or advice.