I have been using mine for a few years now and never had this issue. And I'm not sure what sequence I turn them on and I know for a fact I have turned them on with out the probes connected.
If you got them new I would immediately return them if that's not an optionI would contact maverick. Their customer service seems on point.
No sense trying to make something to work when it's new. Also knowing my luck once the warranty expires it would start doing the same problem.
Sent from my iPhone using Tapatalk