One thing I learned as an inspector is installers seldom make one mistake if they are making mistakes. It is worth inspecting each circuit you are having trouble with paying particular attention to the neutrals. Folks tend to get sloppy with them assuming they are grounded conductors, what could go wrong but if they get grounded or share current with another circuit on the load side of a GFCI/AFCI it will trip. You may find multiple problems once you start looking but you have to start somewhere..