Hey everyone....been a while but finally got to the bottom of the problem. Since May I haven't had any more outages so didn't worry about it, but last weekend it started doing it again so my buddy who is an electrician was over today and pointed out one of the connectors was very corroded on the lines feeding the meter through the mast on the roof. Called our utility company and an hour later the lineman came over and respliced all 3 wires. And just like that....back in business!
I still plan to switch out the panel at some point.
Thanks again for everyone's help - most of you were spot on with where to look for the problem. I just didn't notice the corroded connector on the roof.......
Here's the connector/splice that was corroded.....
