CommandBar Control Failing

[Odd Spot]

I currently working on an add-in that serializes an object to a binary
file. The object that is serialized contains an arraylist of objects.
The add-in deserializes the file, adds an object to the arraylist and
then re-serializes the object to persist the data.

After three or four consecutive re-serializations the button on my
custom outlook CommandBar stops working, in fact the whole CommandBar
stops working.

Does anyone know what is going on here? Is there an issue with the
ArrayList adjusting it's capacity?

Thanks