Back in 2010 my wife and I purchased a home and have the power upgraded before we moved in. I posted about it in this forum (Upgrading electrical questions and had the work done.
Since then we've had our front bathroom remodeled, which included new lighting fixtures and a ceiling ventilation fan addition.
About a month ago I noticed that the lights in the front bathroom would flicker once or twice in the evening while I helped bath my toddler.
About the same time, I noticed that the table fan we have in our master bedroom would sometimes cycle down - almost like the power was lowering and the fan would slow down. This would happen a few times a day (I was in the room for most of the day, with the fan on non stop).
This weekend while sitting around, the power went off in our master bedroom. Neither my wife and I recall doing anything such as turning on/off something when it happened. I went out to the master panel and saw that one of the breakers had tripped. I reset it and it was good to go.
Yesterday while sitting in our family room, I heard a beep go off in our master bedroom. It's the beep my printer makes when it's unplugged from it's outlet without being powered entirely down first. I was watching TV so waited for a commercial before going to see what was up, when I got to the master bedroom everything looked fine (power was working). Later in the night the same thing happened again. This time I was in the room, but only noticed it because our desk fan powered down and then powered back on.
Today while sitting my master bedroom part of our houses power went off. The outlets in the master bedroom (but not the lights) went out, as did the fridge in the kitchen.
I believe these are all on the same breaker, as shown in the picture below.
Any clue what would be causing this?