RE: Thermal circuit breaker problem
How old is it?
I recall that Blue Seas had a recall on an earlier model, although it may not be related to*your problem.
When the breaker opens, can you feel any heat coming from the switch?
Do you have a backup that you can test?
If it has been tripping frequently, it will generally be more likely to trip in the future, so trying out a new one might be the easiest/cheapest solution.
Double check that it is the proper size for the application, 50A isn't that much if you have large loads on that side.