Six months ago I remodeled my kitchen. Even though nobody is using AFCI breakers or recepticles in my area, I decided to use AFCI/GFCI receptacles as opposed to GFCI's. The particular circuit in question is a 20 amp circuit run on new 12/2. I've double checked connections at both ends. They are good. The only thing on this circuit is the AFCI receptacle and 1 additional receptacle, running off the load side of the AFCI. No issue's until about a week ago. Then one morning, no power. I unplugged everything and tried resetting the receptacle, but it tripped. At that point, not being used to AFCI I forgot to check whether that was a GFCI or AFCI trip? We had a mouse issue a week before and I assumed it may have chewed through some of the insulation. This Saturday when I went to re-run the line, it was fine. I tested it a few times to make sure it came back on. I also put a pretty decent load on it to test. No issues. What could have caused this? Is there something I could do to troubleshoot or prevent this in the future?