The biggest problem is the trigger built of mixed pedigree metals. It rusts rapidly and especially a wire connector linkage. This causes the trigger to bind, usually in a fail-to-fire mode.
The number of parts in both the bolt and trigger group is excessive, metalurgy uncertain. That is a recipe for problems.
As I have stated repeatedly, I have limited A-Bolt time, yet they have failed more times in my presence than all other brands and models combined.
I own an A-Bolt in 375. I know a guide using an A-Bolt in 375 and he does not baby it. He has close to 20 years on it and it has worked fine in bad salty conditions. The trigger parts do not rust and corrode in his rifle... The uncertainty of the metalurgy is the issue, I believe.
I own quite a few Brownings of other models and have nothing against Browning, other than the A-Bolt...
art
