You know, if you want to have an indication of how well your electrical system is doing, do what the Cardiologists do to test your heart - do a stress test. But instead of using a treadmill (which might work great as a big electrical load, but most of the commercial ones are 220 volts), use an electrical heater that draws near your 15 amp circuit limit, and that has a pilot light. Then, one by one plug this heater/load tester into your circuits for 15 minutes or more. Observe the pilot light - if you see it flickering at all (or you smell smoke, or the circuit cuts out) you have an electrical circuit problem probably caused by poor wiring connections.
This is how I accidentally found poor wiring in an insulation displacement connector AC outlet in my Bighorn. The heater SEEMED to work normally, except for the flickering pilot light when plugged into the defective outlet. The heater pilot light did not flicker when the heater was plugged into another outlet (on the same circuit, I might add). This caused me to replace ALL of the AC outlets (except the GFI, which wasn't IDC) with regular household screw terminal outlets.
This test is not infallible (like the cardiac stress test isn't infallible), but CAN be a good indicator of possible future electrical problems.
BTW, I also had a wirenut/wiring problem, but with the water heater. On my unit, the water heater supply hot and neutral were stripped and crammed close together at the wire nuts, and intermittently shorted, tripping the water heater circuit breaker.