Hello. I recently purchased a Little Mark 3 and and a TC Electronic 410 (8ohms)bass cab. I bought them both used separately on Kijiji. The head worked fine when I tested it. When I tested the LM3 Head on the cab, it worked with a 1/4 jack to speak on and when I got home, it worked for about 20 minutes and then the power to the speakers cut out. I ran my guitar combo through the cabinet @ 8 ohms to see if it was the cab, but it worked. I feared that the head was blown as I believe this model has issues with the power amp going out. I took it to my I’m space and tried it on a GK810(NEO I believe, 4ohms) and it worked fine. This made me think it was possibly the speak-on cable so I retested my cab with the one from my jam space and the LM3 head still does not work with the RS410. I opened up the cab and took a look and all of the connection in the head, connectors for the cab seem to be solid. I am at a loss to what the problem is and what to trouble shoot next. Is it possible that the head will only produce sound at 4 ohms? Why would it suddenly stop producing sound at 8ohms? Any and all insight is greatly appreciated.