First of all, you can't "upgrade" a breaker to 20Amp unless ALL the wiring on that circuit is 12Ga. If redistributing what is plugged into which receptacle doesn't work, you need new circuit(s).

I'd want to first map out all that is on each circuit to see if redistributing the loads would help. What else is on that den/office circuit? What you describe shouldn't trip a 15 amp breaker.

For the dishwasher, I use the Energy Saver option, i.e. no heated drying, allowing the dishes to air dry by setting the door ajar after the wash/rinse cycles are complete. Slower, but less power use.

"you can't "upgrade" a breaker to 20Amp unless ALL the wiring on that circuit is 12Ga." - This is the info I was wondering - and I suppose there is no way to ever know if it's 12ga without the building plans in hand, :-(

"no heated drying" - Unfortunately the power breaker goes off at 2am in the middle of a wash cycle before the soap is even 100% gone - drying seems OK if it manages to get to it. Though to not use some features of a standard appliance because it breaks the house, kind of tells me there is something seriously wrong with the house.

Redistributing - the dishwasher is a dedicated 15a breaker - though I suppose we could run a 50' extension cord through our house to another room so the the laser printer doesn't trip a breaker. Yea, that's normal. :-)

It seems like we are just going to have to live with it. Thanks for the feedback though - it confirms some things for us.

If you have the Canon imageCLASS LBP6030w it's wireless so if you have wi-fi you could move the printer to a circuit whose breaker wouldn't blow every time you printed a job.

1. As others have pointed out, you can't simply substitute 20A breakers for 15A ones. You would be violating the electrical code and creating a potential fire risk.

2. Although you want to avoid the expense of an electrician, you need one to figure out if: 1) there is a problem with an intermittent fault that triggers these problems, or 2) if there is more load on these circuits than you realize.

Obviously there is something very wrong. Not only wrong, but dangerous. Yet you don’t want to pay a professional, licensed electrician to discover the cause? Is your house only worth $150? Is your safety worth only $150? Is your family’s life worth only $150? You don’t know enough about wiring to fix this this, but you don’t want to pay a professional? You don’t know what else is wrong. But what is wrong is getting shocked or electrocuted or burning out an appliance or burning your house down. Pick up the phone.

Two more thoughts:

I can't imagine why a house built in 2018 would have receptacle circuits on 15 amp breakers. (They ran out of 20 amp breakers?) I'd check the wiring to see if they were indeed wired with #12 and could be changed to 20 amp breakers.

You may have high resistance short circuits in those circuits (nails driven through the cable?) An electrician could check this out by unplugging everything and testing to see if there is still current flowing.

JM$.02W

Are these AFCI breakers? They can be sensitive to false trips. If you Google “AFCI laser printer” you’ll find a ton of people reporting that their printers cause their AFCI breakers to trip.