I suspect this is the problem. This is a very slow move speed. I bet you’re cooking the bits and snapping them that way. I’d increase move speed to at a MINIMUM of 150 IPM at about 12-14k RPM with a minimum DOC of .25.
You have to make big enough chips to evacuate the heat and at those slow speeds you’re likely making dust and recutting chips causing a lot of heat.
You can check the runout on the new router with a dial indicator to see if it’s got bad bearings, but I suspect that’s not the case given you feedrates.