Flat foot question.

[marckubu 0]

First post so go easy on me. Tried searching for a topic similar to this but I had no luck.

Over the last 10 years I've notice my left skate always seemed to wear out quickly or so I thought at least. It always seemed like my left ankle would start to sink in the more the skate broke in. The blades sits correctly on the ice it just seems like the boot starts to bend somewhat. I'm not sure if it's an ankle issue or maybe an arch issue that could be fixed. I don't have the problem with my right foot. I just purchased a new pair of skates so before the skates have the same problem I'd like to try and solve the problem before hand.

Any advice would be great. Thanks.