I’ve been running the bed on my TAZ at 85C and it has been working great until last night. Today it will heat to 85C then gradually go back down to 55C or so. If I turn the bed off (0C) wait for a bit (5minutes) and turn it back on it will go back to 85C then gradually go back down. I even set it to 70C with the same result. I thought it may have been the connector so I unconnected and reconnected both the power and signal leads. When the bed is cool the signal lead on the bed read 104Kohms, not sure if you need this but I saw it asked for in another post.